JP6376626B2 - Data storage method, data storage device, and storage device - Google Patents

Description

  The present invention relates to storage technology. More specifically, the present invention relates to a data storage method, a data storage device, and a storage device.

  In a storage device having a file system, data written to the storage device must be atomic. Atomicity refers to the complete operation of a transaction, that is, the data associated with the transaction must be written completely or not at all. In the prior art, data inseparability is guaranteed on the disc. Data in the cache is usually not atomic. That is, only the data stored on the disk is considered as reliable data and can be provided for the host. In general, if there is a failure in the storage device, the data needs to be restored from the cache, and the data in the cache is written to disk. When data in the cache is written to the disk, log means are used to ensure that the data written to the disk is atomic. When the host sends an access request for accessing the data to the storage device, the atomic data needs to be first obtained from the disk and then provided to the host. This prolongs the processing time of the access request sent by the host.

  Embodiments of the present invention provide a data storage method, a data storage apparatus, and a storage device that improve the data access efficiency of a host.

According to a first aspect, an embodiment of the present invention provides a data storage method applied to a storage system, wherein the storage system includes a storage device and a host, and the storage device is a first controller. The first controller includes a cache protection area and a first write cache, and the cache protection area provides a data protection function;
The method
Receiving a file processing request by the first controller, dividing the file processing request into a plurality of file operations, separately executing the file processing for each file operation, and generating a plurality of file operation information; When,
Writing all of the plurality of file operation information into the cache protection area;
Restoring the plurality of file operation information from the cache protection area when power is turned on again after a failure occurs in the first controller;
Obtaining the data information according to the plurality of file operation information so that the host can access the data information, and writing the data information to the first write cache;
including.

With respect to the first aspect, in the first possible implementation method, the step of writing all of the plurality of file operation information into the cache protection area comprises the steps of:
Requesting storage space in the cache protection area for each file operation information;
Storing each file operation information in the requested storage space;
Determining that all of the plurality of file operation information is already stored in a corresponding storage space;
Storing data in the storage space in which the plurality of file operation information is stored in a data structure corresponding to the cache protection area;
including.

With respect to the first aspect, in the second possible implementation method, the step of writing all of the plurality of file operation information into the cache protection area includes:
Continuously transmitting each file operation information to the cache protection area;
Determining that all of the plurality of file operation information has already been transmitted to the cache protection area; and setting a flag corresponding to the plurality of file operation information received in the cache protection area. The flag is used to indicate that all of the plurality of file operation information has already been written to the cache protection area; and
including.

Regarding the first possible implementation manner of the first aspect, in a third possible implementation manner, the storage device comprises a memory, the memory comprises a protection area,
The method
Determining that the cache protection area comprises the plurality of file operation information according to the data structure corresponding to the cache protection area when there is a failure in the first controller;
Storing the plurality of file operation information in the protection area of the memory by using a power failure protection program;
Is further provided.

Regarding the second possible implementation manner of the first aspect, in a fourth possible implementation manner, the storage device comprises a memory, the memory comprises a protection area,
The method
If the first controller is faulty, determining according to the flag that the cache protection area comprises the plurality of file operation information;
Storing the plurality of file operation information in the protection area of the memory by using a power failure protection program;
Is further provided.

Regarding the first aspect, in a fifth possible implementation manner, the storage device comprises a second controller, the second controller comprises a second write cache,
The method
In accordance with the plurality of file operation information, the second controller obtains data information corresponding to the file processing request and writes the data information to the second write cache by the first controller. The method further includes the step of transmitting file operation information to the second controller.

According to a second aspect, an embodiment of the present invention provides a data storage method applied to a storage system, the storage system comprising a storage device and a host, wherein the storage device is a first controller. And a second controller and a memory, the second controller comprises a write cache, and the method comprises:
The first controller receives a file processing request, divides the file processing request into a plurality of file operations, executes file processing separately for each file operation, and generates a plurality of file operation information, Transmitting the plurality of file operation information to the second controller;
If there is a failure in the first controller, the file can be accessed by the second controller so that the host can access data information or perform an operation corresponding to the file processing request for the memory. Obtaining the data information according to operation information and writing the data information to the write cache;
It comprises.

With respect to the second aspect, in the first possible implementation method, the step of transmitting the plurality of file operation information to the second controller comprises: sending a first mirror message to the second controller by the first controller; Comprising the step of transmitting,
The first mirror message includes the plurality of file operation information.

With respect to the second aspect, in the second possible implementation method, the step of transmitting the plurality of file operation information to the second controller comprises:
Sending a plurality of second mirror messages to the second controller by the first controller;
Each of the second mirror messages includes one of the plurality of file operation information.

Regarding the second aspect, in a third possible implementation method, the second controller comprises a cache protection area, the cache protection area providing a data protection function,
Before the step of obtaining data information according to the file operation information by the second controller and writing the data information to the write cache, the method comprises:
The method further includes writing all the file operation information in the cache protection area by the second controller.

With respect to the third possible implementation manner of the second aspect, in a fourth possible implementation manner, the method comprises: from the cache protection area if the second controller is faulty and is powered on again. , Further comprising the step of restoring the plurality of file operation information,
The step of acquiring data information according to the file operation information by the second controller and writing the data information to the write cache,
The second controller includes obtaining the data information according to the plurality of file operation information stored in the cache protection area, and writing the data information to the write cache.

Regarding the third possible implementation method of the second aspect, in the fifth possible implementation method, the step of writing all the file operation information into the cache protection area by the second controller comprises:
Requesting storage space in the cache protection area for each file operation information;
Storing each file operation information in the requested storage space;
Determining that all of the plurality of file operation information is already stored in a corresponding storage space;
Storing data in the storage space in which the plurality of file operation information is stored in a data structure corresponding to the cache protection area;
It comprises.

Regarding the third possible implementation method of the second aspect, in the sixth possible implementation method, the step of writing all the file operation information into the cache protection area by the second controller comprises:
Continuously transmitting each file operation information to the cache protection area;
Determining that all of the plurality of file operation information has already been transmitted to the cache protection area;
Setting a flag corresponding to the plurality of file operation information received in the cache protection area, wherein the flag indicates that all of the plurality of file operation information has already been written in the cache protection area. Used to show the steps.

According to a third aspect, an embodiment of the present invention provides a data storage device,
A file configured to receive a file processing request, divide the file processing request into a plurality of file operations, execute the file processing separately for each file operation, and generate a plurality of file operation information A processing module;
A writing module configured to write all of the plurality of file operation information to a cache protection area;
A restoration module configured to restore the plurality of file operation information from the cache protection area when power is turned on again after a failure occurs in the first controller;
Comprising
The writing module is further configured to acquire the data information and write the data information to a first write cache according to the plurality of file operation information so that the host can access the data information.

With respect to the third aspect, in a first possible implementation method, the lighting module comprises:
Request storage space in the cache protection area for each file operation information;
Storing each file operation information in the requested storage space;
Determining that all of the plurality of file operation information is already stored in the corresponding storage space;
The data structure corresponding to the cache protection area is configured to store data in the storage area where the plurality of file operation information is stored.

With respect to the third aspect, in a second possible implementation, the lighting module comprises:
Each file operation information is continuously sent to the cache protection area,
Determining that all of the plurality of file operation information has already been transmitted to the cache protection area;
Configured to set a flag corresponding to the plurality of file operation information received in the cache protection area;
The flag is used to indicate that all of the plurality of file operation information has already been written in the cache protection area.

Regarding the first possible implementation manner of the third aspect, in a third possible implementation manner, the apparatus further comprises a protection module;
The protection module determines that the cache protection area includes the plurality of file operation information according to the data structure corresponding to the cache protection area when the first controller has a fault, and a power failure By using a protection program, the plurality of file operation information is stored in a protected area of the memory.

Regarding the second possible implementation manner of the third aspect, in a fourth possible implementation manner, the apparatus further comprises a protection module;
When the first controller has a failure, the protection module determines that the cache protection area includes the plurality of file operation information according to the flag, and uses a power failure protection program. The plurality of file operation information is configured to be stored in a protected area of a memory.

Regarding the third aspect, in a fifth possible implementation method, the apparatus further comprises a transmission module;
The transmission module transmits the plurality of file operation information to the second controller so that the second controller can acquire data information corresponding to the file processing request in accordance with the plurality of file operation information. Information is written to the second write cache of the second controller.

According to a fourth aspect, an embodiment of the present invention provides a storage device, the storage device comprising a first controller, a second controller, and a memory, wherein the second device The controller has a write cache,
The first controller receives a file processing request, divides the file processing request into a plurality of file operations, performs file processing separately for each file operation, and generates a plurality of file operation information, The plurality of file operation information is configured to be transmitted to the second controller,
The second controller, in accordance with the file operation information, allows a host to access data information or perform an operation corresponding to the file processing request for the memory if the first controller is faulty. The data information is acquired, and the data information is written to the write cache.

With respect to the fourth aspect, in a first possible implementation manner, the first controller is specifically configured to send a first mirror message to the second controller;
The first mirror message includes the plurality of file operation information.

Regarding the fourth aspect, in a second possible implementation manner, the first controller is specifically configured to send a plurality of second mirror messages to the second controller;
Each of the second mirror messages includes one of the plurality of file operation information.

  With respect to the fourth aspect, in a third possible implementation method, the second controller is further configured to write all the file operation information to a cache protection area.

  With respect to the third possible implementation manner of the fourth aspect, in the fourth possible implementation manner, the second controller requests storage space in the cache protection area for respective file operation information. Each file operation information is stored in the requested storage space, and it is determined that all of the plurality of file operation information is already stored in the corresponding storage space, and the cache protection region is supported. The data structure is particularly configured to store data in the storage space where the plurality of file operation information is stored.

Regarding the third possible implementation method of the fourth aspect, in the fifth possible implementation method, the second controller continuously transmits respective file operation information to the cache protection area, and Is specifically configured to determine that all of the file operation information has already been transmitted to the cache protection area and to set a flag corresponding to the plurality of file operation information received in the cache protection area,
The flag is used to indicate that all of the plurality of file operation information has already been written in the cache protection area.

According to a fifth aspect, an embodiment of the present invention provides a storage device comprising a processor, a memory, a system bus, and a communication interface, wherein the processor, the memory, and the communication interface are the Connected using the system bus and communicate with each other,
The communication interface is configured to communicate with a storage device;
The memory is configured to store computer-executable instructions;
The processor is configured to execute the computer execution instructions to implement the data storage method described in the first aspect.

  In the embodiment of the present invention, all of the plurality of file operation information corresponding to the file processing request is written in the cache protection area. Since the cache protection area provides a data protection function, when the power is turned on again after a failure occurs in the first controller, the plurality of file operation information can be restored from the cache protection area, Data information is acquired based on the plurality of file operation information and written to the first write cache. Since all of the plurality of file operation information is written in the cache protection area, when the power is turned on again after the failure of the first controller, the file operation information restored from the cache protection area is also Everything is complete. Therefore, the data information acquired according to the plurality of file operation information is atomic and can be directly accessed by the host. In the prior art, the data information of the first write cache is not atomic, and only the data in the memory is atomic. Therefore, in the prior art, the data information of the first write cache is not directly accessible by the host, and the corresponding data must be read from the memory before being provided for the host. Compared to the prior art, the embodiment of the present invention improves the data access efficiency of the host.

  To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments or the prior art. It is apparent that the accompanying drawings in the following description illustrate some embodiments of the present invention, and those skilled in the art will recognize other drawings from these accompanying drawings without creative activity. Can be derived.

1 is a schematic diagram of an application network configuration of a data storage method according to an embodiment of the present invention. 3 is a flowchart of a data storage method according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a data structure according to an embodiment of the present invention. It is the schematic of the application network structure of the other data storage method by embodiment of this invention. 5 is a flowchart of another data storage method according to an embodiment of the present invention. 1 is a schematic configuration diagram of a data storage device according to an embodiment of the present invention. 1 is a schematic configuration diagram of a storage device according to an embodiment of the present invention. It is a schematic block diagram of the other storage device by embodiment of this invention.

  In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical description in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Describe the solution. Apparently, the described embodiments are a part rather than all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art without creative activity based on the embodiments of the present invention fall within the protection scope of the present invention.

[System Architecture in the Embodiment of the Present Invention]
The data storage method provided by the embodiment of the present invention can be implemented in a storage system. FIG. 1 is a schematic diagram of an application network configuration of a data storage method according to an embodiment of the present invention. As shown in FIG. 1, the storage system includes at least one application server 11 (three are shown in FIG. 1), at least one controller 22, and one memory 33. .

  The application server 11 (also referred to as a host) may include any computing device known in the prior art, such as, for example, a server or a desktop computer.

  The controller 22 transmits data to the application server 11 using the NFS / CIFS protocol and may be any computing device known in the prior art, such as a server or desktop computer. The controller 22 includes a processor and a cache (not shown in the figure). The processor is specifically configured to perform various operations for file processing requests, such as, for example, a file creation operation, a file open operation, a file read operation, and a file write operation. The cache is a memory in the controller and has a capacity smaller than that of the hard disk, but is much faster than the hard disk. For example, the cache may be a random access memory (RAM) that is used for a program or short-term It is mainly configured to store data for doing so.

  In the controller 22, a file system such as a power failure protection module and a mirroring module and other applications are further installed. The power failure protection module is configured to write data in the cache to the memory through a BBU or other backup power when the system has a power failure, and the mirroring module is connected to another controller through a mirror channel. 22 is configured to process data transmitted.

  In embodiments of the present invention, the cache may comprise a temporary cache or a write cache. The temporary cache is configured to temporarily store data and metadata corresponding to the file processing request, and does not provide a data protection function. The write cache is configured to store data to be written to the memory, and provides the data protection function. The fact that the temporary cache does not provide data protection means that if the system is faulty or if the system has a power failure, all data stored in the temporary cache will be lost, This means that it cannot be restored even after the system is powered on again. The fact that the write cache provides the data protection function means that the data stored in the write cache is not lost even if the system has a fault or the system has a power failure. Means that. Specifically, the data protection function may be a power failure protection function, and the power failure protection function stores the write cache in the write cache after a power failure occurs in the system. By using a backup power supply (BBU) or other power supply method to have enough power to write data to the disk protection area of the memory, power can still be supplied. The data can be copied from the disk protection area of the memory to the write cache after the system is powered on again. Therefore, the data stored in the write cache can be considered reliable and is not lost.

  As an option, the data protection function may be a reset cache protection function, the reset cache protection function indicates that the write cache is continuously powered and the system has a power failure. In some cases, the operation of writing the data stored in the write cache to the memory is not performed, and when the system is powered on again, the data in the write cache is not initialized. Therefore, the data stored in the write cache is still data before a power failure occurs in the system. Similarly, in a write cache having this function, the data stored in the write cache can be considered reliable and is not lost.

  Optionally, the data protection function may be other functions that ensure that data in the write cache is not lost, and is not limited to this specification.

  In embodiments of the present invention, the temporary cache and the write cache may be located in the same physical entity or in different physical entities and are not limited herein. When the temporary cache and the write cache are located in different physical entities, the temporary cache does not provide the data protection function, and when the system has a power failure, the temporary cache Data is lost and cannot be recovered, but the write cache provides the data protection function. If the temporary cache and the write cache are located in the same physical entity (eg, a memory module), the power failure protection module provides power failure protection for data stored in the temporary cache. Although determined not to provide, it provides power failure protection for the data stored in the write cache.

  In addition, the cache protection area may be created in the write cache, and the cache protection area also has the data protection function. When the data of the temporary cache needs to be written to the write cache, the data or information obtained according to the data may first be written to the cache protection area, and then according to the data or the data After it is determined that the acquired information is normally written to the cache protection area, the data is written to the write cache. Therefore, even if the system fails before the data is written to the write cache, or even if writing to the write cache is not completed, the data is stored in the data or the cache protection area. It can be restored by using the stored information. Optionally, a portion of the cache space may be divided into the cache and used as the cache protection area, or another independent cache may be used as the cache protection area, There is no limitation here. It should be noted that the write cache indicates a cache excluding the cache protection area unless specified by the embodiment of the present invention.

  The format of the stored data in the cache protection area may be different from that in the temporary cache or the write cache. For example, in an embodiment of the present invention, the temporary cache and the write cache may store data in units of data pages. The size of the data page may be 4k, 8k, or 16k, and is not limited here. As an example, the data page size is 4k. When the data size is 8k, it is necessary to occupy two pages. However, the cache protection area may store data in the form of a data structure such as a control link, a linked list, or a tree, and is not limited here. Therefore, since the data storage format in the cache protection area may be different from the data storage format in the write cache, it can be understood that when storing the same data, the cache protection area occupies less than the storage space. .

  The memory 33 is known in the prior art such as a hard disk drive (HDD), a solid state drive (SSD), or a direct access storage device (DASD). A storage device may be provided.

  In the embodiment of the present invention, the controller 22 and the memory 33 may be collectively referred to as a storage device.

  Unless otherwise specified, the system in the embodiment of the present invention is referred to as a storage system, and the memory in the embodiment of the present invention refers to a nonvolatile memory.

[Data storage method]
Hereinafter, a data storage method provided by an embodiment of the present invention will be described. FIG. 2 is a flowchart of the data storage method in the embodiment of the present invention. The method is applied to a storage system, the storage system comprising a storage device and a host, the storage device comprising a first controller and a memory, wherein the first controller is a temporary cache, A cache protection area and a first write cache, the method comprising:

  Step 21: The first controller receives a file processing request.

  In the embodiment of the present invention, the file processing request is transmitted by an application server (also referred to as a host). The operation type of the file processing request may be, for example, a file processing request for correcting data stored in the memory, such as a file write request, a file correction request, a file creation request, or a file deletion request. Then it is not limited. Different file processing requests may include different parameters. For example, a file write request is used as an example, and the file write request includes parameters such as a file ID, a file offset (offset), a file length (length), and data to be written.

  Step 22: The file processing request is divided into a plurality of file operations, each file operation is processed separately, a plurality of file operation information is generated, and the information is written to the temporary cache.

  In a storage device having a file system, when processing a file processing request, the file system often needs to divide the file processing request into a plurality of file operations according to the operation type of the file processing request. For example, the file system needs to divide a file write request into a data correction file operation and a metadata correction file operation. In another example, the file system needs to divide a file creation request into a parent directory modification file operation and a file creation file operation. In yet another example, the file system sends a file rename request to a source directory. It is necessary to divide into a correction file operation and an update destination directory correction file operation.

  Optionally, if the file system divides the file processing request into the plurality of file operations according to the operation type of the file processing request and processes the operations separately, the number of all data entries, and The number of metadata entries corresponding to the file processing request may be recorded.

  When processing a file processing request, the first controller does not actually perform semantic conversion or other file processing continuously for each file operation divided from the file processing request. Can understand. Each time a file operation is processed, the first controller writes data and metadata corresponding to the file operation to the temporary cache. Accordingly, after the first controller processes the last file operation and writes the data and metadata corresponding to the last file operation to the temporary cache, it responds to all the data and the file processing request. The metadata is also written to the temporary cache. Therefore, in the embodiment of the present invention, the data stored in the temporary cache is all the data and the metadata corresponding to the file processing request. Similarly, in the embodiment of the present invention, the plurality of file operation information are all the data and the metadata corresponding to the file processing request.

  In different file processing requests, the file operation information generated for the different file processing requests is also different. When the file processing request is a file write request, the file operation information of the file processing request may be data to be written, metadata, or the like carried by the file write request. When the file processing request is a file correction request, the file operation information of the file correction request may be data to be written, metadata, or the like carried by the file correction request. When the file processing request is a file creation request, the file operation information of the file creation request may be directory information, metadata, or the like. When the file processing request is a file deletion request, the file operation information of the file deletion request may be special page data for releasing a file space, the deleted data and metadata, and the like.

  The following steps are described using a file write request as an example. In the file write request, file operation information generated for the file write request may include a file ID, a file offset (offset), a file length (length), a write time, data to be written, and the like.

  It should be noted that in an embodiment of the present invention, the temporary cache is used only for temporarily storing data. The data stored in the temporary cache is discrete and the data is not managed by using a specific data structure. The data stored in the temporary cache cannot be provided directly to the application server.

  Step 23: Write the plurality of file operation information into the cache protection area.

  Specifically, the first controller can write the file operation information such as a file ID, a file offset, a file length, a writing time, and data to be written in the cache protection area. The cache protection area provides a data protection function. After the file operation information is normally written in the cache protection area, the file operation information is not lost due to a system failure or the like.

  In any embodiment, writing the plurality of file operation information to the cache protection area indicates that all of the plurality of file operation information has been written to the cache protection area, ie, all the data And the metadata corresponding to the file processing request is written in the cache protection area.

  For example, the cache protection area may store data by using a specific data structure. As shown in FIG. 3, the data in the cache protection area can be managed in the form of a control link. The control link includes a plurality of control headers, and each control header corresponds to a file processing request. A plurality of slots are mounted under each control header, and each slot is used for storing each data or each metadata corresponding to the file processing request.

  Specifically, the file operation information can be traversed. First, one slot is requested for first data (eg, file ID) in the control link, and after the slot is successfully requested, the first data is written to the slot. One slot is then requested for second data (eg, offset), and after the slot is successfully requested, the second data is written to the slot. The rest is processed in the same manner until the last data of the file operation information is written in the slot. A control header corresponding to the file processing request may be added to the control link.

  After the control header corresponding to the file processing request is added to the control link, all the data and the metadata corresponding to the file processing request have already been normally written in the cache protection area. Is shown.

  As another example, the data in the cache protection area may be managed in the form of a binary tree. The binary tree includes a plurality of root nodes, and each root node corresponds to a file processing request. A plurality of terminal nodes are mounted on each root node. Each end node is used to store respective data or respective metadata corresponding to the file processing request.

  Specifically, the file operation information can be traversed. First, one terminal node is requested for the first data (eg, file ID) in the binary tree, and after the terminal node is successfully requested, the first data is written to the terminal node. . One termination node is then requested for second data (eg, offset), and after the termination node has been successfully requested, the second data is written to the termination node. The rest is processed in the same manner until the last data is written to the terminal node. A root node corresponding to the file processing request may be added to the binary tree.

  After the root node corresponding to the file processing request is added to the binary tree, all the data and the metadata corresponding to the file processing request are already normally written in the cache protection area. Show.

  A control link or binary tree is used in the cache protection area and is a data structure format for storing data. In addition, data structures such as B-trees, B + trees, red and black trees may be used to store data, but are not limited here.

  Alternatively, the cache protection area does not have to store data using a data structure such as a control link or a binary tree. The first controller may traverse the file operation information. First, the first controller requests a storage space for first data (for example, a file ID) in the cache protection area, and after the storage space is normally requested, the first controller Write the first data to the storage space. And the first controller requests a storage space for second data (eg, offset) in the cache protection area, and after the storage space is normally requested, the cache protection area Write the second data into the storage space. The rest is processed in the same manner until the last data is written in the storage space of the cache protection area. And a flag (eg, true) is set to the cache protection to indicate that all the data and the metadata corresponding to the file processing request have been successfully written to the cache protection area. The file operation information stored in the area can be set. Optionally, other flags (eg, false) may be set if not all the data and the metadata corresponding to the file processing request have been written to the cache protection area.

  Alternatively, if the file system divides the file processing request into a plurality of file operations to process them separately, the file system collects statistics and includes all data entries included in the file operation information and The number of metadata entries is recorded, and a software module in the first controller having a counter or similar function is set. The initial value of the counter is zero. Each data included in the file operation information is continuously written in the requested storage space of the cache protection area. Each time data is normally written, the counter value is incremented by one. If the value of the counter is equal to the recorded number of all the data entries and the metadata entries included in the file operation information, all the data and the metadata corresponding to the file processing request are This indicates that data has already been successfully written to the cache protection area.

  In an optional embodiment, writing the plurality of file operation information to the cache protection area refers to an operation of writing the plurality of file operation information to the cache protection area, that is, all the data and the file There is no need to consider whether the metadata corresponding to the processing request has been written to the cache protection area.

  In another embodiment of the present invention, if all of the plurality of file operation information are not written to the cache protection area and the first controller has a failure, the processing of the file processing request fails. Is considered.

  Step 24: If there is a failure in the first controller, the file operation information stored in the cache protection area is copied to the protection area of the memory by using a power failure protection program.

  Since the cache protection area provides the data protection function, when there is a failure in the first controller, the power failure protection program stores the file operation information stored in the cache protection area in the memory. It can be seen from the above description that it can be used to copy to a protected area. Therefore, the file operation information stored in the cache protection area is not lost due to the failure in the first controller. The protected area of the memory refers to a storage space that is in the memory and is specifically used to store data written by using the power failure protection program. Optionally, the file operation information may be found by searching using a data structure (eg, control link) corresponding to the cache protection area, or the file operation information includes “true” The search may be performed using a flag, but is not limited here.

  Since step 23 has two different embodiments, step 24 is different in the specific implementation.

  For example, when the first implementation method is executed in step 23 (writes all of the plurality of file operation information to the cache protection area), for the file operation information stored in the cache protection area No other processing is executed, and step 242 (copying the file operation information stored in the cache protection area to the protection area of the memory) is executed.

  If the second implementation method is executed in step 23 (does not consider whether all the data and the metadata corresponding to the file processing request have been written to the cache protection area), step 242 is executed. In addition to:

  Step 241: It is determined whether the file operation information includes all the data and the metadata corresponding to the file processing request.

  If the file operation information includes all the data and the metadata corresponding to the file processing request, Step 242: By using the power failure protection program, the file operation information stored in the cache protection area The file operation information is copied to the protected area of the memory.

  If the file operation information does not include all the data and the metadata corresponding to the file processing request, power failure protection processing is not performed for the file operation information stored in the cache protection area. .

  It should be noted that in the embodiment of the present invention, step 24 is an optional step. Therefore, as described above, in addition to the power failure protection function, the data protection function may be a reset memory protection function. If the cache protection area has the reset memory protection function, even if the first controller fails, the cache protection area can continue to supply power, and the first controller can be supplied again. After the power is turned on, the data in the cache protection area is not initialized. Therefore, the data stored in the cache protection area is not lost.

Specifically, determining whether the file operation information includes all the data and the metadata corresponding to the file processing request,
The statistics of the number of the data entries included in the file operation information in the cache protection area are collected, and the number of all the data entries recorded in the file system, and the file If the number of data entries included in the file operation information in the cache protection area is equal to the number recorded in the file system, compared with the number of metadata entries corresponding to the processing request For example, the file operation information indicates that all the data and the metadata corresponding to the file processing request are included, or
It is checked whether the data structure (eg, control link) corresponding to the cache protection area includes a data structure (eg, control header) corresponding to the file processing request, and the control link includes the control header. If so, the plurality of file operation information stored in the data structure corresponding to the file processing request includes all the data and the metadata corresponding to the file processing request. Or
Check whether the file operation information stored in the cache protection area includes a flag (eg, “true”), and if the file operation information includes a flag that is “true”, It may indicate that the file operation information includes all the data and the metadata corresponding to the file processing request.

  In addition, in another embodiment of the present invention, step 23 is performed without considering whether all the data and the metadata corresponding to the file processing request have been written to the cache protection area, and If it is not determined whether the file operation information includes all the data and the metadata corresponding to the file processing request, step 242: stored in the cache protection area by using the power failure protection program The file operation information is directly copied to the protected area of the memory.

  In the embodiment of the present invention, it should be noted that the plurality of file operation information written to the cache protection area may be all the data and the metadata corresponding to the file processing request. In another embodiment of the present invention, the plurality of file operation information written in the cache protection area include all the data stored in the temporary cache and the address of the metadata corresponding to the file processing request. It may be. If the first controller is faulty and the power failure protection needs to be provided for the data stored in the cache by using the power failure protection program, the temporary cache All the stored data and the metadata corresponding to the file processing request are first obtained according to the addresses of the metadata corresponding to all the data and the file processing request, and then all The data and the metadata corresponding to the file processing request are copied to the protected area of the memory.

  Step 25: When the power is turned on again after the failure of the first controller, a plurality of file operation information is restored from the cache protection area.

  When the cache protection area has the power failure protection function, the file operation information stored in the protection area of the memory can be copied to the cache protection area by using the power failure protection program. . When the cache protection area has the reset memory protection function, the data in the cache protection area is not initialized.

  Optionally, if the first implementation method (writes all the plurality of file operation information into the cache protection area) is executed in step 23, step 252: the memory stored in the protection area of the memory Copying file operation information to the cache protection area may be executed.

  Optionally, the second implementation method (not considering whether all the data and the metadata corresponding to the file processing request is written to the cache protection area) is executed in step 23, and in step 24, After determining that the file operation information includes all the data and the metadata corresponding to the file processing request, the file operation information of the cache protection area is copied to the protection area of the memory If so, Step 252: Copying the file operation information stored in the protected area of the memory to the cache protected area may be executed.

  Optionally, when the second implementation method (not considering whether all the data and the metadata corresponding to the file processing request are written to the cache protection area) is executed in step 23 and step 24 It is not determined whether the file operation information includes all the data and the metadata corresponding to the file processing request, and the file operation information in the cache protection area is directly copied to the protection area of the memory. Step 25 may include the following:

  Step 251: It is determined whether the file operation information stored in the protected area of the memory includes all the data and the metadata corresponding to the file processing request. If it is determined that the metadata corresponding to the data and the file processing request is included, Step 252: The file stored in the protection area of the memory by using the power failure protection program The operation information is copied to the cache protection area.

Specifically, determining whether the file operation information includes all the data and the metadata corresponding to the file processing request,
Collecting statistics of the number of data entries included in the file operation information stored in the protected area of the memory, and counting the number of all the data entries recorded by the file system And the number of the data entries included in the file operation information stored in the protection area of the memory is compared with the number of the metadata entries corresponding to the file processing request by the file system. If the number is equal to the number recorded, the file operation information indicates that all the data and the metadata corresponding to the file processing request are included, or in the protected area of the memory Check whether the stored file operation information includes a flag (eg, “true”) If the file operation information includes a flag that is “true”, it indicates that the file operation information includes all the data and the metadata corresponding to the file processing request. It can be said that.

  Step 26: Acquire data information according to the plurality of file operation information so that the host or the memory can access the data information, and write the data information to the first write cache.

  Specifically, the data information may be acquired according to the plurality of file operation information stored in the cache protection area. The data information may be all the data and the metadata corresponding to the file processing request, or all the data and the metadata addresses stored in the cache protection area. After the data information is acquired, the data information is written to the first write cache.

  When the data information is the metadata corresponding to all the data and the file processing request, the first write cache uses the cache protection area to correspond to all the data and the file processing request. It should be noted that all the data and the metadata corresponding to the file processing request are stored in a format different from the format used to store the file. For example, the first write cache may store the data in a page format, and the cache protection area may store the data in, for example, a control link data structure.

  When power is turned on again after a failure occurs in the first controller, the plurality of file operation information restored from the cache protection area are related to all the data and the metadata corresponding to the file processing request. This can be understood from the above explanation. Therefore, the data information acquired according to the plurality of file operation information and written to the first write cache is also stored in the metadata corresponding to all the data and the file processing request, or in the cache protection area This is the address of all the data and metadata that are being processed. That is, the data written to the first write cache in response to the file processing request meets the inseparability requirement. Thus, the data information can be accessed by the host or the memory.

  Specifically, accessing the data information by the host indicates that the host sends a file access request to the first controller, and the file access request includes data corresponding to the file processing request. Used for access. For example, when the file processing request is a file write request, the file access request may need to access data to be written corresponding to the file write request. After receiving the file access request, the first controller may send the data to be written stored in the first write cache to the host.

  Specifically, accessing the data information by the memory includes writing all the data stored in the first write cache and the metadata corresponding to the file processing request to the memory. Show. Since the capacity of the first write cache is less than the capacity of the hard disk, when the data stored in the first write cache reaches a certain threshold, the data stored in the first write cache is: Need to be written to the memory.

  As an option, after the data information is obtained according to the file operation information, the plurality of file operation information stored in the cache protection area may be deleted.

  In the embodiment of the present invention, all the plurality of file operation information corresponding to the file processing request is written in the cache protection area. Since the cache protection area provides a data protection function, when the power is turned on again after a failure of the first controller, the plurality of file operation information can be restored from the cache protection area, Data information is acquired and written to the first write cache according to a plurality of file operation information. Since all the plurality of file operation information are written in the cache protection area, the file operation information restored from the cache protection area when the power is turned on again after a failure occurs in the first controller, Everything is complete. Therefore, the data information acquired according to the plurality of file operation information is atomic and can be directly accessed by the host or the memory. In the prior art, the data information in the first write cache is not atomic, and only the data in the memory is atomic. Therefore, in the prior art, the data information of the first write cache cannot be directly accessed by the host, and the corresponding data must be read from the memory before being provided to the host. Compared to the prior art, embodiments of the present invention improve the host's data access efficiency.

  In the foregoing embodiment, after executing step 26, the first controller also stores all the data and the metadata corresponding to the file processing request according to the data information stored in the first write cache. The data and the metadata can be written to the memory. Since the capacity of the first write cache is limited, in general, when the data in the first write cache reaches a certain threshold, the data stored in the first write cache is stored in the memory. Can be written.

  Optionally, when all the data and the metadata corresponding to the file processing request are written to the memory, information not written to the memory is stored to indicate data that is not currently written to the memory May be. If there is a failure in the process of writing the data and the metadata to the memory in the first controller, the power failure protection is provided to write the information that has not been written to the memory into the protection area of the memory. A program may be used. After the first controller is turned on again, the data not written to the memory can be obtained according to the information not written to the memory, and the data not written to the memory is stored in the memory. Written continuously. Accordingly, it is possible to avoid repetitively writing data already written in the memory, thereby improving data writing efficiency.

  Optionally, after all the data and the metadata corresponding to the file processing request have been written to the memory, the information not written to the memory may be deleted.

  In addition, the embodiment of the present invention can be applied to a storage system including two controllers. As shown in FIG. 4, the storage system includes at least one application server 11 (three are shown in FIG. 3), two controllers 22, and one memory 33.

  The structures and functions of the application server 11, the controller 22, and the memory 33 are the same as those described in the above-described embodiment, and details thereof will not be described repeatedly.

  The difference is that the embodiment of the present invention can include two controllers 22, which have the same physical structure and function, and that can handle file processing requests sent by the application server 11. Data that can be received and stored in the memory 33 is accessed. In addition, the two controllers 22 may communicate with each other, for example, transferring data through a mirror channel or other method.

  For ease of explanation, the two controllers 22 are classified into a first controller and a second controller. The write cache included in the first controller is referred to as a first write cache, and the write cache included in the second controller is referred to as a second write cache.

  The second write cache has the same hardware structure as the first write cache. When the first controller is a primary controller and the second controller is a secondary controller, the attribute of the second write cache is a mirror, and the second write cache is data transmitted by the first controller. Is configured to receive. In this case, the data in the second write cache is not provided to the host or written to the memory. When the second controller is a primary controller and the first controller is a secondary controller, the attribute of the second write cache is local. In this case, the data of the second write cache can be provided to the host or written to the memory.

  Optionally, the embodiment of the present invention may further include transmitting the plurality of file operation information to the second controller by the first controller.

  Optionally, the first controller may send the plurality of file operation information to the second controller after step 22. The plurality of file operation information may be all the data and the metadata corresponding to the file processing request. Specifically, the first controller may send a mirror message to the second controller. The mirror message includes the plurality of file operation information. Alternatively, when the first controller divides the file processing request into a plurality of file operations and processes each file operation separately, the first controller processes the file operation and generates corresponding data every time. , A mirror message may be sent to the second controller. The mirror message includes data corresponding to the file operation. After sending the last mirror message to the second controller, the first controller sends a confirmation message to the second controller to notify the second controller that the plurality of file operation information has already been sent. Can be sent to.

  As an option, the first controller may transmit the plurality of file operation information to the second controller after step 23. Regarding the transmission method, the first controller transmits a mirror message to the second controller, and the mirror message includes the plurality of file operation information, or the first controller transmits the plurality of mirror messages to the second controller. Sent to the second controller, each mirror message contains data corresponding to the file operation. After sending the last mirror message to the second controller, the first controller sends a confirmation message to the second controller to notify the second controller that the plurality of file operation information has already been sent. Send to controller.

  As an option, the first controller may transmit the plurality of file operation information to the second controller after step 24. The specific transmission method is the same as that described above, and details will not be repeated.

  After receiving the plurality of file operation information, the second controller first writes the plurality of file operation information into the cache protection area, and the plurality of file operation information has already been normally written into the cache protection area. After that, the data information is written into the second write cache. The data information refers to all the data and the metadata corresponding to the file processing request stored in the cache protection area, or all the data and the metadata corresponding to the file processing request Points to the address. It should be noted that the cache protection area refers to a cache protection area included in the second controller.

  Therefore, the data information stored in the second write cache matches the data information stored in the first write cache. If there is a failure in the first controller, the second controller changes the attribute of the second write cache locally so that the operation can be continued by replacing the first controller. For example, according to the data information stored in the second write cache, an operation corresponding to the file processing request is executed on the memory, or the data information stored in the second write cache Is provided to the host.

  In the prior art, when there is a failure in the first controller, the second controller must first read log information from the memory, obtain the data information according to the log information, and then send the data to the host. Provide information. In an embodiment of the present invention, when there is a failure in the first controller, the second controller may directly provide the data information stored in the second write cache to the host. As can be seen from the above, in the embodiment of the present invention, the data access efficiency of the host is improved.

  Hereinafter, another data storage method according to the embodiment of the present invention will be described in detail. The method is applied to a storage system. The storage system includes a storage device and a host. The storage device includes a first controller, a second controller, and a memory. The second controller includes a write cache and a cache protection area. The write cache and the cache protection area provide a data protection function. As shown in FIG. 5, the method includes:

  Step 51: The first controller receives a file processing request, divides the file processing request into a plurality of file operations, executes file processing separately for each file operation, and stores a plurality of file operation information. Generate.

  The file processing request is transmitted by an application server (also referred to as a host). The operation type of the file processing request may be, for example, a file processing request for correcting data stored in the memory, such as a file write request, a file correction request, a file creation request, or a file deletion request. There is no limitation here. Different file processing requests may include different parameters. For example, when a file write request is used as an example, the file write request includes parameters such as a file ID, a file offset (offset), a file length (length), and data to be written.

  In a storage device having a file system, when the file system processes the file processing request, it is often necessary to divide the file processing request into a plurality of file operations according to the operation type of the file processing request. For example, the file system needs to divide a file write request into a data correction file operation and a metadata correction file operation. In another example, the file system needs to split a file creation request into a parent directory modification file operation and a file creation file operation. In yet another example, the file system needs to split a file name change request into a source directory modification file operation and an update destination directory modification file operation.

  Optionally, when the file system divides the file processing request into the plurality of file operations according to the operation type of the file processing request and executes each file operation separately, the number of all data entries, The number of metadata entries corresponding to the file processing request may be recorded.

  When processing a file processing request, it can be understood that the first controller actually performs semantic conversion or other file processing continuously for each file operation separated from the file processing request. Each time a file operation is processed, the first controller writes data and metadata corresponding to the file operation into a temporary cache. Accordingly, after the first controller processes the last file operation and writes the data and metadata corresponding to the last file operation to the temporary cache, it responds to all the data and the file processing request. The metadata is also written to the temporary cache. Therefore, in the embodiment of the present invention, the data stored in the temporary cache is all the data and the metadata corresponding to the file processing request. Similarly, in the embodiment of the present invention, the plurality of file operation information is all the data and the metadata corresponding to the file processing request.

  In different file processing requests, the file operation information generated for the different file processing requests is also different. When the file processing request is a file writing request, the file operation information of the file processing request may be written data, metadata, or the like carried in the file writing request. When the file processing request is a file correction request, the file operation information of the file correction request may be data to be written, metadata, or the like carried in the file correction request. When the file processing request is a file creation request, the file operation information of the file creation request may be directory information, metadata, or the like. When the file processing request is a file deletion request, the file operation information of the file deletion request may be special page data for releasing a file space, the deleted data and metadata, and the like.

  The following steps are described using a file write request as an example. In the file write request, the file operation information generated in the file write request may include a file ID, a file offset (offset), a file length (length), a write time, data to be written, and the like.

  Step 52: Write the plurality of file operation information into the second controller.

  Optionally, the first controller may send a mirror message to the second controller. The mirror message includes the plurality of file operation information, or when the first controller divides the file processing request into a plurality of file operations and processes each file operation separately, the file operation is performed. After processing and generating corresponding data each time, the first controller may send a mirror message to the second controller. The mirror message includes data corresponding to the file operation. After sending the last mirror message to the second controller, the first controller sends a confirmation message to the second controller to notify the second controller that the plurality of file operation information has already been sent. It may be sent to the controller.

  Step 53: The second controller writes all the file operation information in the cache protection area.

  Specifically, the second controller may write the file operation information such as a file ID, a file offset, a file length, a writing time, and data to be written into the cache protection area. The cache protection area provides a data protection function. When the file operation information is normally written in the cache protection area, the file operation information is not lost due to a system failure or the like.

  Writing the plurality of file operation information to the cache protection area indicates that all the plurality of file operation information is written to the cache protection area, that is, to all the data and the file processing request. It should be noted that the corresponding metadata is written to the cache protection area.

  For example, the cache protection area stores data by using a specific data structure. As shown in FIG. 3, the data in the cache protection area can be managed in the form of a control link. The control link includes a plurality of control headers, and each control header corresponds to a file processing request. A plurality of slots are mounted under each control header, and each slot is used to store each data or each metadata corresponding to the file processing request.

  Specifically, the file operation information can be traversed. First, one slot is requested for first data (eg, file ID) in the control link, and after the slot is successfully requested, the first data is written to the slot. One slot is then requested for second data (eg, offset), and after the slot is successfully requested, the second data is written to the slot. The rest is processed in the same manner until the last data of the file operation information is written in the slot. A control header corresponding to the file processing request may be added to the control link.

  After the control header corresponding to the file processing request is added to the control link, all the data and the metadata corresponding to the file processing request have already been normally written in the cache protection area. Is shown.

  As another example, the data in the cache protection area may be managed in the form of a binary tree. The binary tree includes a plurality of root nodes, and each root node corresponds to a file processing request. A plurality of terminal nodes are mounted on each root node. Each end node is used to store respective data or respective metadata corresponding to the file processing request.

  Specifically, the file operation information can be traversed. First, one terminal node is requested for the first data (eg, file ID) in the binary tree, and after the terminal node is successfully requested, the first data is written to the terminal node. . One termination node is then requested for second data (eg, offset), and after the termination node has been successfully requested, the second data is written to the termination node. The rest is processed in the same manner until the last data is written to the terminal node. A root node corresponding to the file processing request may be added to the binary tree.

  After the root node corresponding to the file processing request is added to the binary tree, all the data and the metadata corresponding to the file processing request are already normally written in the cache protection area. Show.

  The control link or binary tree is a data structure format for storing data used in the cache protection area. In addition, data structures such as B-trees, B + trees, red and black trees may be used to store data, but are not limited here.

  Alternatively, the cache protection area does not have to store data using a data structure such as a control link or a binary tree. The first controller may traverse the file operation information. First, the first controller requests a storage space for first data (for example, a file ID) in the cache protection area, and after the storage space is normally requested, the first controller Write the first data to the storage space. And the first controller requests a storage space for second data (eg, offset) in the cache protection area, and after the storage space is normally requested, the cache protection area Write the second data into the storage space. The rest is processed in the same manner until the last data is written in the storage space of the cache protection area. And a flag (eg, true) is set to the cache protection to indicate that all the data and the metadata corresponding to the file processing request have been successfully written to the cache protection area. The file operation information stored in the area can be set. Optionally, other flags (eg, false) may be set if not all the data and the metadata corresponding to the file processing request have been written to the cache protection area.

  Alternatively, when the file system divides the file processing request into a plurality of file operations in order to process the file processing requests separately, the file system includes the number of all data entries and metadata entries included in the file operation information. A software module in the second controller may be set that collects, records, and counters or similar functions. The initial value of the counter is zero. Each data included in the file operation information is continuously written in the requested storage space of the cache protection area. Each time data is normally written, the counter value is incremented by one. If the value of the counter is equal to the recorded number of all the data entries and the metadata entries included in the file operation information, all the data and the metadata corresponding to the file processing request are This indicates that data has already been successfully written to the cache protection area.

  Step 54: The second controller acquires data information according to the file operation information, and writes the data information to the write cache.

  Specifically, the data information is the metadata corresponding to all the data and the file processing request stored in the cache protection area, or all the data and the file processing request. The address of the metadata corresponding to.

  If there is a failure in the first controller, the second controller provides the data information stored in the write cache to the host, or an operation corresponding to the file processing request, eg, file creation , Delete file, write to file, and execute to the memory.

  Step 53 is an optional step, and when there is a failure in the second controller in the process of writing the data information to the write cache, the data according to the plurality of file operation information stored in the cache protection area Note that it is used to recover information and write the data information to the write cache.

Similarly, embodiments of the present invention
When there is a failure in the second controller, according to a data structure corresponding to the cache protection area, it is determined that the cache protection area includes the plurality of file operation information, and a power failure protection program is used. Storing the plurality of file operation information in a protected area of the memory, or
When there is a failure in the second controller, it is determined that the cache protection area includes the plurality of file operation information according to the flag, and the plurality of file operation information is obtained by using a power failure protection program. In the protected area of the memory.

  For specific embodiments, refer to Steps 23 to 26 in the above-described embodiment, and will not be described in detail again here.

  As an option, in an embodiment of the present invention, after the first controller writes the plurality of file operation information to the cache protection area of the first controller, the first controller is faulty and turned on again. The plurality of file operations may be restored from the cache protection area of the first controller, the data information may be acquired according to the file operation information, and the data information may be written to the write cache of the first controller. May include. For specific embodiments, refer to Steps 23 to 26 in the above-described embodiment, and will not be described in detail again here.

  In the prior art, data inseparability is guaranteed in the memory, and the data in the write cache cannot be provided directly to the host. Therefore, if there is a failure in the first controller, the second controller reads the corresponding log information from the memory, restores the data information from the write cache according to the log information, and sends the information to the host. Need to provide. However, in an embodiment of the present invention, before the failure occurs, the first controller transmits the plurality of file operation information to the second controller, and the second controller transmits the data according to the plurality of file operation information. Since the information is acquired and the data information is written to the write cache, the second controller can directly provide the data of the write cache to the host when there is a failure in the first controller, or the file processing An operation corresponding to the request may be performed on the memory.

[Apparatus according to an embodiment of the present invention]
An embodiment of the present invention provides a data storage device, as shown in FIG.
A file configured to receive a file processing request, divide the file processing request into a plurality of file operations, execute the file processing separately for each file operation, and generate a plurality of file operation information A processing module 61;
A writing module 62 configured to write all the plurality of file operation information to a cache protection area;
A restoration module 63 configured to restore the plurality of file operation information from the cache protection area when the power is turned on again after a failure occurs in the first controller;
The writing module 62 is further configured to acquire data information according to the plurality of file operation information and write the data information to a first write cache so that the host can access the data information.

Optionally, the lighting module 62 is
Request storage space in the cache protection area for each file operation information;
Storing each file operation information in the requested storage space;
Determining that all the plurality of file operation information are already stored in the corresponding storage space;
The data structure corresponding to the cache protection area is particularly configured to store data in the storage area where the plurality of file operation information is stored.

Optionally, the lighting module 62 is
Each file operation information is continuously sent to the cache protection area,
Determining that all of the plurality of file operation information has already been transmitted to the cache protection area;
Particularly configured to mark the plurality of file operation information received in the cache protection area as normal data;
The normal data is used to indicate that all the plurality of file operation information has already been written in the cache protection area.

Optionally, the device is
When there is a failure in the first controller, it is determined that the cache protection area includes the plurality of file operation information according to the data structure corresponding to the cache protection area, and a power failure protection program is used. A protection module 64 configured to store the plurality of file operation information in a protection area of a memory, or
When there is a failure in the first controller, it is determined according to the flag that the cache protection area includes the plurality of file operation information, and the plurality of file operation information is obtained by using a power failure protection program. May be further included in the protection area 64 of the memory.

Optionally, the device is
It may further comprise a deletion module 65 configured to delete the plurality of file operation information stored in the cache protection area.

Optionally, the device is
The plurality of files so that the second controller can acquire data information corresponding to the file processing request in accordance with the plurality of file operation information and write the data information to the second write cache of the second controller. A transmission module 66 configured to transmit operation information to the second controller may be further included.

  The apparatus provided by an embodiment of the present invention may be set by the first controller described in the previous embodiment, and is configured to perform the data storage method described in the previous embodiment. ing. For a detailed description of the function of the various modules, reference is made to the description made in the method embodiment, and details are not described here again.

  FIG. 7 illustrates a storage device according to an embodiment of the present invention. The storage device includes a first controller 71, a second controller 72, and a memory, and the second controller includes a write cache.

  The first controller 71 receives a file processing request, divides the file processing request into a plurality of file operations, executes separate file processing for each file operation, and generates a plurality of file operation information, The plurality of file operation information is transmitted to the second controller 72.

  Optionally, the first controller 71 is specifically configured to send a first mirror message to the second controller 72, the first mirror message comprising the plurality of file operation information.

  Optionally, the first controller 72 is specifically configured to send a plurality of second mirror messages to the second controller 72, each second mirror message including one of the plurality of file operation information. Contains one.

  When the first controller 71 has a failure, the second controller 72 can access the data information or execute an operation corresponding to the file processing request on the memory. Data information is acquired according to the operation information, and the data information is written to the write cache.

  Optionally, the second controller 72 is further configured to write all the file operation information to the cache protection area.

Specifically, the second controller 72 requests storage space in the cache protection area for each file operation information, stores each file operation information in the requested storage space, It is determined that all the plurality of file operation information are already stored in the corresponding storage space, and data is stored in the data structure corresponding to the cache protection area. Configured to store in a storage space, or
The second controller 72 continuously transmits each file operation information to the cache protection area, determines that all the plurality of file operation information has already been transmitted to the cache protection area, Sets a flag corresponding to the plurality of file operation information received in the protection area, and the flag is used to indicate that all the plurality of file operation information has already been written to the cache protection area It is configured to be.

  Optionally, the second controller 72 determines that the cache protection area includes the plurality of file operation information according to the data structure corresponding to the cache protection area, and uses a power failure protection program. To further store the plurality of file operation information in the protected area of the memory.

  As an option, the second controller 72 determines that the cache protection area includes the plurality of file operation information according to the flag, and uses the power failure protection program to thereby determine the plurality of file operation information. Is further stored in the protected area of the memory.

  The storage device according to an embodiment of the present invention comprises at least two controllers as described in the previous embodiments, and is configured to execute the data storage method described in the previous embodiments. It is a device. For a detailed description of the function of the controller, reference is made to the description made in the method embodiment and will not be described in detail again here.

FIG. 8 illustrates a storage device according to an embodiment of the present invention. The storage device is
A processor 101, a memory 102, a system bus (also simply referred to as “bus”) 105, and a communication interface 103 are provided. The processor 101, the memory 102, and the communication interface 103 are connected by using the system bus 105 and communicate with each other.

  The processor 101 may be a single-core or multi-core central processing unit, an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. .

  The memory 102 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.

  The communication interface 103 is configured to communicate with a storage device.

  The memory 102 is configured to store computer execution instructions 1021. Specifically, the computer execution instruction 1021 may include program code.

  When the computer is running, the processor 101 can execute the computer execution instructions 1021 and execute the procedure of the method shown in FIG.

  For convenience and concise description, details of the operation processing of the devices and modules described above can be clearly understood by those skilled in the art by referring to the processing in the corresponding method embodiment described above. I won't go into detail again.

  It can be appreciated that in some embodiments provided by the present invention, the disclosed devices and methods may be implemented in other ways. For example, the described device embodiments are merely exemplary. For example, the division of the module is simply a division by a logical function, and may be another division in actual implementation. For example, multiple modules or components may be combined, incorporated into other devices, or some features may not be ignored or performed. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be implemented through several communication interfaces. The indirect coupling or communication connection between the devices or modules may be implemented in electrical, mechanical, or other form.

  Modules described as separate parts may or may not be physically separated, and parts shown as modules may or may not be physical modules. Or may be distributed to a plurality of network sub-modules. All or some of the modules may be selected according to the actual need to achieve the purpose of the solution of the above embodiment.

  In addition, the functional modules according to the embodiments of the present invention can be integrated into one processing module, each module can be physically present, or two or more modules can be integrated into one module. May be.

  A person skilled in the art can understand that all or part of the steps of the embodiment may be implemented by hardware or a program instructing appropriate hardware. The program may be stored in a computer readable recording medium. The recording medium may include a read-only memory, a magnetic disk, or an optical disk.

  Finally, it should be noted that the above-described embodiments are merely illustrative of the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art will understand that the nature of the technical solution corresponding to the technical solution is within the scope of the technical solution of the embodiment of the present invention by such modification or replacement. It should be understood that the technical solutions described in the foregoing embodiments can be modified or equivalently replaced with some or all technical features without departing from the above.

DESCRIPTION OF SYMBOLS 11 Application server 22 Controller 33 Memory 61 File processing module 62 Writing module 63 Restoration module 64 Protection module 65 Deletion module 66 Transmission module 71 1st controller 72 2nd controller 101 Processor 102 Memory 103 Communication interface 1021 Computer execution instruction

Claims (14)

A data storage method, the method being applied to a storage system, the storage system comprising a storage device and a host, the storage device comprising a first controller, a second controller, and a memory. The second controller comprises a cache protection area having a data protection function and a write cache;
The method
Receiving a file processing request by the first controller;
Dividing the file processing request into a plurality of file operations by the first controller;
A step of separately executing file processing for each of the plurality of file operations by the first controller to generate a plurality of file operation information;
Transmitting all of the plurality of file operation information corresponding to the file processing request to the second controller by the first controller;
Writing all of the plurality of file operation information corresponding to the file processing request to the cache protection area by the second controller;
By using the power failure protection program by the second controller, all of the plurality of file operation information corresponding to the file processing request are stored in the protected area of the memory based on the failure of the second controller. Steps,
Determining by the second controller that the second controller is powered on again;
Copying all of the plurality of file operation information corresponding to the file processing request from the protection area to the cache protection area by the second controller;
Obtaining data information of the file processing request according to all of the plurality of file operation information corresponding to the file processing request by the second controller;
Writing the data information to the write cache by the second controller for the host to access the data information when the first controller is faulty;
A data storage method comprising: The step of transmitting all of the plurality of file operation information corresponding to the file processing request to the second controller;
Sending a first mirror message to the second controller by the first controller, wherein the first mirror message comprises all of the plurality of file operation information;
The method of claim 1. The step of transmitting all of the plurality of file operation information corresponding to the file processing request to the second controller;
Transmitting a plurality of second mirror messages to the second controller by the first controller, each of the second mirror messages comprising one of all of the plurality of file operation information;
The method of claim 1. The step of writing the data information into the write cache by the second controller;
Requesting storage space in the cache protection area for each of the file operation information;
Combining the plurality of file operation information stored in the requested storage space into a data structure to indicate that all of the plurality of file operation information corresponding to the file processing request are in a cache protection area; ,
Storing information describing the data structure in the cache protected area;
The method of claim 1. The step of writing the data information into the write cache by the second controller;
Continuously transmitting each of the file operation information to the cache protection area;
Determining that all of the plurality of file operation information has already been transmitted to the cache protection area;
Setting a flag corresponding to all of the plurality of file operation information received in the cache protection area, wherein the flag has all of the plurality of file operation information already written to the cache protection area; Used to indicate that
The method of claim 1. Prior to the step of storing all of the plurality of file operation information in the protected area of the memory, the method comprises:
Determining, based on the data structure corresponding to the cache protection area, that the second controller has already stored all of the plurality of file operation information in the cache protection area;
The method of claim 4 , further comprising: Prior to the step of storing all of the plurality of file operation information in the protected area of the memory, the method comprises:
Determining by the second controller, based on a flag, that all of the plurality of file operation information has already been stored in the cache protection area;
The method of claim 5 , further comprising: A storage device including a first controller, a second controller, and a memory, the second controller including a cache protection area having a data protection function, and a write cache;
It said first controller receives a file processing demand, the split the file processing demand to a plurality of files operations, said plurality corresponding to the file processing request file operation information of the plurality of respective order to produce a file A file process is separately executed for an operation, and all of the plurality of file operation information corresponding to the file process request is transmitted to the second controller.
The second controller writes all of the plurality of file operation information corresponding to the file processing request to the cache protection area, and the plurality of files corresponding to the file processing request based on a failure of the second controller All of the operation information is stored in the protection area of the memory, the second controller determines that the power is turned on again, and all of the plurality of file operation information corresponding to the file processing request is stored in the protection area. The data is copied to the cache protection area, and the data information of the file processing request is obtained according to all of the plurality of file operation information corresponding to the file processing request. Write the data information to the write cache to access the information. Configured to writing,
Storage device. The first controller is configured to send a first mirror message to the second controller, the first mirror message comprising all of the plurality of file operation information;
The storage device according to claim 8. The first controller is specifically configured to send a plurality of second mirror messages to the second controller, each of the second mirror messages comprising one of all of the plurality of file operation information;
The storage device according to claim 8. The second controller requests storage space of the cache protection area for each of file operation information, stores each file operation information in the requested storage space, and the plurality of files corresponding to the file processing request In order to indicate that all of the operation information is in the cache protection area, the plurality of file operation information stored in the requested storage space is collected into a data structure, and the data structure in the cache protection area is described. The storage device of claim 8, wherein the storage device is specifically configured to store information to be stored. The second controller continuously transmits each of the file operation information to the cache protection area, determines that all of the plurality of file operation information has already been transmitted to the cache protection area, and the cache protection Specifically configured to set a flag corresponding to all of the plurality of received file operation information in the region, wherein the flag has all of the plurality of file operation information already written to the cache protection region Used to show that
The storage device according to claim 8. Before storing all of the plurality of file operation information in the protection area of the memory, the second controller is configured such that all of the plurality of file operation information is already stored in the cache protection area. Further configured to determine based on the data structure corresponding to a cache protected area;
The storage device according to claim 11. Before storing all of the plurality of file operation information in the protection area of the memory, the second controller sets a flag indicating that all of the plurality of file operation information has already been stored in the cache protection area. Further configured to determine based on:
The storage device according to claim 12.