WO2017024951A1

WO2017024951A1 - Data storage method and system

Info

Publication number: WO2017024951A1
Application number: PCT/CN2016/092333
Authority: WO
Inventors: 贾晓林; 许慧锋; 陈昊
Original assignee: 华为技术有限公司
Priority date: 2015-08-07
Filing date: 2016-07-29
Publication date: 2017-02-16
Also published as: CN106445840B; CN109783401B; CN109783401A; CN106445840A

Abstract

A data storage method and system (220). The method comprises: selectively transmitting, by a host computer (210), target data to a first controller (221) or a second controller (222) (510); if the first controller (221) receives the target data, determining, by the first controller (221), according to responsibility information in the target data, whether the first controller (221) is responsible for processing the target data (520); if not, forwarding, by the first controller (221), the target data to the second controller (222); if so, transmitting, by the first controller (221), the target data to a first buffer apparatus (224) or a second buffer apparatus (225) to store the same (530) and obtain first image data; and when it is required to store the data in the buffer apparatuses to a storage device (223), storing, by the first controller (221), data including the target data, processed by the first controller (221) and stored in the first buffer apparatus (224) or the second buffer apparatus (225), to the storage device (223) (560). The method lowers a controller memory requirement, and decreases stress of transmitting image data between controllers.

Description

Data storage method and storage system

Technical field

The present invention relates to the field of storage, and in particular, to a data storage method and a storage system.

Background technique

Most of the data calculated in the host computer will eventually be sent to the storage device for storage. In order to ensure the reliability of the process of storing data to the storage device, the storage system usually adopts a multi-controller structure. For example, as shown in FIG. 1, the storage system 120 includes a first controller 121, a second controller 122, and a storage device 123. The first controller 121 is used for data communication with the host computer 110, and the second controller 122 is also used for data communication with the host computer 110. The first controller 121 and the second controller 122 pass PCIe/IB (nfiniband). The first controller 121 is connected to the storage device 123, and the second controller is also connected to the storage device 123.

Since the speed of reading and writing data between the host computer 110 and the controller is much faster than reading and writing data between the host computer 110 and the storage device 123, when the data is frequently read and written, the host computer 110 does not directly store the data to the read. In the storage device 123 with slower writing speed, data is sent to the controller with faster read/write speed until the data in the controller reaches a certain amount or the upper computer 110 determines that the data is to be stored in the storage device 123, and the control is performed. The device sends the data in the controller to the storage device 123 for storage. For example, the host computer 110 first transmits data to any one of the first controller 121 and the second controller 122, and the controller that receives the data stores the received data in the cache of the controller, so that Interact with the host computer 110. In addition, in order to improve the reliability of the data, the controller that receives the data transfers the data to another controller's memory through a path such as PCIe/IB (nfiniband) for storage to obtain a mirror image for backup. Finally, when the data reaches a certain amount or the upper computer 110 determines to store the data to the storage device 123, the controller processes the data in the memory and sends it to the storage device 123 for storage, thereby improving data reading and writing efficiency.

However, in this mode, the space of the mirrored data storage must be reserved in the memory of the controller to accommodate the mirrored data sent by other controllers, so the memory capacity of the controller is relatively large. Moreover, since the bandwidth of the PCIe/IB (nfiniband) path is limited, when there is a large amount of mirrored data, it will put pressure on the normal data transmission of the PCIe/IB (nfiniband) path. Finally, when one of the controllers has a problem, all data can only be stored by the remaining controllers, in order to To ensure the reliability of the data, the remaining controllers will not cache the data in the controller, but directly write to the storage device, which greatly reduces the speed of reading and writing.

Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a storage system and a data storage method, which achieve the requirement of reducing the memory capacity.

In a first aspect, the present invention provides a data storage method, including: at least two controllers including at least a first controller and a second controller, a storage device, and a first cache device and a second cache device At least two cache devices, the first controller is configured to communicate with the upper computer, and the first controller is further connected to the storage device, the first cache device, and the second cache device, respectively The second controller is configured to communicate with the upper computer, the second controller is further connected to the storage device, the first cache device, and the second cache device, where the first controller is connected to the first a second controller, the first cache area and the second home area are disposed in the first cache device, and the first cache area and the second home area are disposed in the second cache device.

The attribute of the first home zone is that the first controller can perform a read operation and a write operation on the first home zone in the first cache device and the first home zone in the second cache device. The second controller can perform a read operation on the first home zone in the first cache device and the first home zone in the second cache device, but cannot perform a write operation.

The attribute of the second home zone is: the second controller can perform a read operation and a write operation on the second home zone in the first cache device and the second home zone in the second cache device. The first controller can perform a read operation on the second home area in the first cache device and the second home area in the second cache device, but cannot perform a write operation;

The first controller receives target data sent by the upper computer;

Determining, by the first controller, whether the target data belongs to the first controller according to the attribution information in the target data;

If not, the first controller forwards the target data to the second controller, and if yes, the first controller sends the target data to the first cache device or the The first home area in the second cache device is stored to obtain first image data;

When the data in the cache device needs to be stored in the storage device, the first controller includes the target data in the first home area of the first cache device and the second cache device The data processed by the first controller is stored in the storage device.

In conjunction with the first aspect, in a first possible implementation manner of the first aspect, the method further includes:

If the first cache device fails, the first controller and the second controller transfer data in the first cache device to the second cache device.

In conjunction with the first aspect, in a second possible implementation manner of the first aspect, the method further includes:

And if the first controller sends the target data to the first cache device to obtain the first mirror data, the first controller further sends the target data to the second cache device Obtaining the second image data.

With reference to the first aspect or the first possible embodiment of the first aspect or the second possible implementation of the first aspect, in a third possible implementation manner of the first aspect of the present invention, when the first control The second controller modifies the attributes of the first home zone in the first cache device and the first home zone in the second cache device when the device is faulty: the second controller pairs the The first home area in the first cache device and the first home area in the second cache device may perform a read operation and a write operation,

The second controller reads data in the first home area of the first cache device and the first home area in the second cache device, and stores the data in the storage device;

After receiving the data sent by the upper computer, the second controller may send the data sent by the upper computer to the first home area in the first cache device and the first home area in the second cache device for storage. .

With reference to the first aspect or the first possible embodiment of the first aspect or the second possible implementation of the first aspect, in the fourth possible implementation manner of the first aspect of the present invention, if the first control And the second controller fail, when the third controller replaces the first controller, and after the fourth controller replaces the second controller, the third controller is from the first cache device Reading the data stored by the first controller in the first home zone and/or the first home zone in the second cache device, the fourth controller from the second one of the first cache devices The home area and/or the second one of the second cache devices reads data stored by the second controller to recover data traffic.

In a second aspect, the present invention provides a storage system, including: at least two controllers including at least a first controller and a second controller, a storage device, and a first cache device and a second cache device At least two cache devices, the first controller is configured to communicate with the upper computer, and the first controller is further connected to the storage device, the first cache device, and the second cache device, respectively, The second controller is configured to communicate with the upper computer, the second controller is further connected to the storage device, the first cache device, and the second cache device, and the first controller is connected to the second a first home area and a second home area are disposed in the first cache device, and the first cache area and the second home area are disposed in the second cache device.

The first controller is configured to receive target data sent by the upper computer;

The first controller is configured to determine, according to the attribution information in the target data, whether the target data belongs to the first controller, and if the determination result is no, forwarding the target data to the second control And sending the target data to the first cache area of the first cache device or the second cache device for storage to obtain first mirror data;

The first controller is further configured to: when the data needs to be stored from the cache device to the storage device, include the target data in the first home area of the first cache device and the second cache device The data processed by the first controller is stored in the storage device.

With reference to the second aspect, in a first possible implementation manner of the second aspect of the present invention, the first controller and the second controller are configured to: when the first cache device fails, the first The data in the cache device is transferred to the second cache device.

With reference to the second aspect, in a second possible implementation manner of the second aspect of the present invention, the first controller is further configured to send, by the first controller, the target data to the first cache device Obtained And when the first image data is obtained, sending the target data to the second cache device to obtain the second image data.

With reference to the second aspect or the first possible embodiment of the second aspect or the second possible implementation of the second aspect, in a third possible implementation manner of the second aspect of the present invention, when the first control The second controller modifies the attributes of the first home zone in the first cache device and the first home zone in the second cache device when the device is faulty: the second controller pairs the The first home area in the first cache device and the first home area in the second cache device may perform a read operation and a write operation,

The second controller is configured to read data in the first home area of the first cache device and the first home area in the second cache device, and store the data in the storage device;

The second controller is further configured to: after receiving the data sent by the upper computer, send the data sent by the upper computer to the first home zone in the first cache device and the first home in the second cache device The area is stored.

With reference to the second aspect or the first possible embodiment of the second aspect or the second possible implementation of the second aspect, in the fourth possible implementation manner of the second aspect of the present invention, in the first control And the second controller fails. When the third controller replaces the first controller, and the fourth controller replaces the second controller,

The third controller is configured to read data stored by the first controller from a first home zone in the first cache device and/or a first home zone in the second cache device;

The fourth controller is configured to read data stored by the second controller from a second home zone in the first cache device and/or a second home zone in the second cache device to recover data business.

By implementing the embodiment of the present invention, the cache device can be additionally set and the mirror data is stored in the cache device, so the controller does not need to provide storage space for the mirror data, thereby reducing the requirement on the controller memory size. Moreover, when the data sent by the host computer reaches the controller, it is not necessary to send data to another controller through the PCIe/IB (nfiniband) path, thereby reducing the PCIe/IB (nfiniband) between the two controllers. The pressure of the data transmission of the path. Finally, when one of the controllers has a problem, the other controller can write the data sent by the host computer to the cache device to ensure data reliability, and the controller does not need to directly write the data to the storage device, thereby Great Increased the speed of writing data. Moreover, the first controller cannot write the second home zone that can be written by the second controller, and the second controller cannot write the first home zone that can be written by the first controller, that is, the first controller and the second controller The storage space that the device can perform write operations is independent of each other, which can prevent conflicts caused by two different controllers simultaneously writing to the same storage unit.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic structural diagram of an embodiment of a prior art storage system;

2 is a schematic structural diagram of a possible implementation manner of a storage system according to the present invention;

3 is a schematic diagram of a first home zone and a second home zone in a cache device in the storage system of the present invention;

4 is a schematic structural diagram of an embodiment of a cache device in a storage system according to the present invention;

5 is a schematic structural diagram of another embodiment of a cache device in a storage system according to the present invention;

6 is a flow chart of an embodiment of a data storage method of the present invention;

7 is a flow chart of another embodiment of a data storage method of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It is to be understood that the terminology used in the embodiments of the present invention is for the purpose of describing the particular embodiments, and is not intended to limit the invention. The singular forms "a", "the" and "the" It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Referring to FIG. 2, FIG. 2 is a schematic structural diagram of a possible implementation manner of a storage system according to the present invention. Ben The storage system 220 of the embodiment includes: a first controller 221, a second controller 222, a storage device 223, a first cache device 224, and a second cache device 225. The first cache device 224 and the second cache device 225 are both multi-port devices. Here, the first cache device 224 and the second cache device 225 each have a first port and a second port.

The first controller 221 is configured to be connected to the host computer 210. The first controller 221 is further connected to the storage device 223, the first port of the first cache device 224, and the first port of the second cache device 225, respectively. The PCIe/IB (nfiniband) is connected to the second controller 222, the second controller 222 is configured to be connected to the host computer 210, and the second controller 222 is connected to the storage device 223, the second port of the first cache device 224, and the second cache device 225. The second port. The first controller 221 is connected between the first port of the first cache device 224 and the first port of the second cache device 225, the second controller 222 and the second port of the first cache device 224, and the second cache device. The second port of 225 can be connected by PCIe/IB (nfiniband). In other embodiments, connections may be made through other buses, which are not specifically limited in the present invention.

The host computer 210 can selectively transmit target data to any one of the first controller 221 and the second controller 222. Since one data cannot be processed by both controllers at the same time, the attribution information of the target data is set in the target data, and the controller can determine whether the target data belongs to itself according to the attribution information. Assuming that the controller that receives the target data is the first controller 221, the first controller 221 determines whether the target data belongs to the first controller 221 based on the information of the controller that belongs to the target data. If the target data does not belong to the first controller 221, the first controller 221 forwards the target data to the second controller 222 via PCIe/IB (nfiniband), and then the second controller 222 controls the belonging according to the target data. The information of the device determines whether the target data belongs to the second controller 222 for processing. If the target data belongs to the first controller 221, the first controller 221 sends the target data to one of the first cache device 224 and the second cache device 225 for storage to obtain the first image data.

When the host computer 210 selects to transmit the target data to the second controller 222, the second controller 222 also performs a similar operation.

When the data in the cache device needs to be stored to the storage device 223, for example, when the data in the cache device reaches the threshold, or the host computer 210 instructs to store the data in the cache device to the storage device 223, the first controller 221 The data processed by the first controller 221 including the target data in the first cache device 224 and the second cache device 225 is stored in the storage device 223. Second The controller 222 also stores data processed by the second controller 222 in the first cache device 224 and the second cache device 225 into the storage device 223.

If the first cache device 224 has a non-destructive failure, the first controller 221 and the second controller 222 may transfer the data in the first cache device 224 to the second cache device 225, and conversely if the second cache device 225 If a failure occurs, the first controller 221 and the second controller 222 can transfer the data in the second cache device 225 to the first cache device 224, thereby improving the security of the data.

In the present embodiment, the first cache device 224 and the second cache device 225 are additionally provided in addition to the first controller 221 and the second controller 222. When the first controller 221 or the second controller 222 receives the target data sent by the host computer 210, the first controller 221 or the second controller 222 may forward the target data to the first cache device 224 or the second cache. The device 225 performs storage to obtain first image data. Therefore, when there is a problem with the target data, the first mirror data as a backup can also be used, which improves the reliability of the data.

In another embodiment, after receiving the target data sent by the host computer 210, the first controller 221 sends the target data to one of the first cache device 224 and the second cache device 225 for storage. In addition to obtaining the first image data, the first controller 221 may also send the target data to another cache device for storage, thereby obtaining the second image data. At this time, each of the first cache device 224 and the second cache device 225 has a data, and even if there is a problem with the data in one of the cache devices, the data in the other cache device can be used, thereby greatly improving the data. reliability.

As shown in FIG. 3, in another embodiment, the first cache device 224 and the second cache device 225 may be configured with a first home zone and a second home zone. The attribute of the first home zone is: the first controller 221 can perform a read operation and a write operation on the first home zone, and the second controller 222 can perform a read operation on the first home zone but cannot perform a write operation. The attribute of the second home zone is that the second controller 222 can perform a read operation and a write operation on the second home zone, and the first controller 221 can perform a read operation on the second home zone but cannot perform a write operation. Therefore, after the first controller 221 receives the target data, the first controller 221 sends the target data to one of the first cache device 224 and the second cache device 225 for storage to obtain the first image data. The first controller 221 sends the target data to the first home area of one of the first cache device 224 and the second cache device 225 for storage to obtain the first image data. If receiving target data The second controller 222 sends the target data to the second home area of one of the first cache device 224 and the second cache device 225 for storage to obtain the first image data.

In another implementation manner, when the first controller 221 fails, the first home area in the first cache device 224 and the first home area in the second cache device 225 may be read by the second controller 222. The data is stored in the storage device 223. After receiving the data sent by the host computer 210, the second controller 222 can send the data sent by the host computer 210 to the first home area and the second in the first cache device 224. The first home zone in the cache device 225 is stored.

At this time, even if one of the controllers fails, the other controller can take over the failed controller, and the read/write operation between the host computer 210 and the storage device 223 cannot be performed normally.

After the fault of the first controller 221 is eliminated, or the first controller 221 is replaced with a new controller, the first controller 221 may read the fault from the first cache device 224 and/or the second cache device 225. Pre-stored data to quickly recover data services.

In another embodiment, if both the first controller 221 and the second controller 222 fail, when the third controller replaces the first controller 221, and the fourth controller replaces the second controller 222, the third The controller reads data stored before the first controller 221 fails from the first home area of the first cache device 224 and/or the second cache device 225, and the fourth controller is from the first cache device 224 and/or the second cache. The second home zone of device 225 reads the data stored prior to the failure of the second controller 222 to recover the data traffic.

Referring to FIG. 4, in order to further improve the reliability of the data, the cache device 400 (which may be the first cache device or the second cache device described above) may have a power-down protection function. When only one piece of mirror data is stored in the first cache device or the second cache device, the first cache device or the second cache device may be correspondingly provided with a power-down protection function. If both the first cache device and the second cache device have one mirror data, the first cache device and the second cache device need to have the power-down protection function.

In order to enable the cache device 400 to have a power-down protection function, in a specific embodiment, the cache device 400 includes a control chip 410, a non-volatile memory 420, and a random access memory 430. The control chip 410 is connected to the non-volatile memory 420, respectively. And a random access memory 430. The part of the non-volatile memory 420 has a storage space as the first space and another part of the storage space as the second space. A part of the storage space of the random access memory 430 is used as the first home area, and a part of the space is empty. The interval is the second home zone.

When the cache device 400 is powered down, the control chip 410 fetches data from the first home zone of the random access memory 420 and stores the data fetched from the first home zone into the first space of the non-volatile memory 430, and Data is fetched from the second home area of the random access memory 420, and data fetched from the second home area is stored to the second space of the nonvolatile memory 430.

After the cache device 400 is powered back on, the control chip 410 fetches data from the first space of the nonvolatile memory 430, and restores the data fetched from the first space to the first home area of the random access memory 420, and The second space of the non-volatile memory 430 fetches data and restores the data fetched from the second space to the second home area of the random access memory to recover the data traffic.

In another specific embodiment, when the cache device 400 is powered off, the control chip 410 fetches data from the first home zone of the random access memory 420, adding a first tag to the data fetched from the first home zone. And storing the data after adding the first label into the non-volatile memory 430, and extracting data from the second home area of the random access memory 420, adding a second label for the data extracted from the second home area And storing the data after adding the second tag into the nonvolatile memory 430.

After the cache device 400 is powered back on, the control chip 410 retrieves data from the non-volatile memory 430, and restores the data in the data from the non-volatile memory 430 to the first tag to the random access memory 420. In a home zone, the data tagged as the second tag in the data fetched from the non-volatile memory 430 is restored to the second home zone of the random access memory 430.

Referring to FIG. 5, the nonvolatile memory and the random access memory in the cache device 400 may also be replaced by a magnetic random access memory 450. The magnetic random access memory 450 has both a random access memory access speed and a nonvolatile memory. The feature of memory power-down save.

It can be understood that, in the above embodiment, only two controllers and two cache devices are used as an example. In other embodiments, the number of controllers may be three or more. In this case, the cache device is used. The number of attribution areas in the field should also increase accordingly, so that one controller corresponds to a home domain. The number of the cache devices may also be four or more, which is not specifically limited in the present invention.

Referring to Figure 6, Figure 6 is a flow diagram of one possible embodiment of the data storage method of the present invention. This embodiment will be described from the perspective of the storage system shown in FIG. 2. Please understand with reference to FIG. 2, in the embodiment, the data storage method includes the following steps:

510: The host computer 210 selectively transmits the target data to the first controller 221 or the second controller 222.

The host computer 210 can selectively transmit target data to any one of the first controller 221 and the second controller 222. Since one data cannot be processed by both controllers at the same time, the attribution information of the target data is set in the target data, and the controller can determine whether the target data belongs to itself according to the attribution information. If the host computer 210 transmits the target data to the first controller 221, the process proceeds to step 520; if the host computer 210 transmits the target data to the second controller 222, the process proceeds to step 540.

520: The first controller 221 determines whether the target data belongs to the first controller 221 according to the attribution information in the target data.

After receiving the target data, the first controller 221 acquires the home information from the target data, and determines whether it belongs to the first controller 221 according to the target data information. If it belongs to the first controller 221, the process proceeds to step 530; if it does not belong to the first controller 221, it is forwarded to the second controller 222, and proceeds to step 540.

530: The first controller 221 sends the target data to the first cache device 224 or the second cache device 225 for storage to obtain the first image data.

The first controller 221 may select to send the target data to the first cache device 224 for storage to obtain the first mirror data, or may select to send the target data to the second cache device 225 for storage to obtain the first mirror data. In a specific implementation, the first cache device 224 and the second cache device 225 are both provided with a first home zone and a second home zone. The attribute of the first home zone is: the first controller 221 can perform a read operation and a write operation on the first home zone, and the second controller 222 can perform a read operation on the first home zone but cannot perform a write operation. The attribute of the second home zone is that the second controller 222 can perform a read operation and a write operation on the second home zone, and the first controller 221 can perform a read operation on the second home zone but cannot perform a write operation. Therefore, the first controller 221 sends the target data to the first home area of one of the first cache device 224 and the second cache device 225 for storage to obtain the first image data. Then, returning to step 510, until it is necessary to store the data in the cache device to the storage device 223, the process proceeds to step 560.

540: The second controller 222 determines, according to the attribution information in the target data, whether the target data belongs to the second controller 222 for processing.

After receiving the target data, the second controller 222 acquires the home information from the target data, and determines whether it belongs to the second controller 222 according to the target data information. If it belongs to the second controller 222, the process proceeds to step 550; if it does not belong to the second controller 222, the target data is forwarded to the first controller 221, and the process proceeds to step 520.

550: The second controller 222 sends the target data to the first cache device 224 or the second cache device 225 for storage to obtain the first image data.

The second controller 222 may select to send the target data to the first cache device 224 for storage to obtain the first mirror data, or may select to send the target data to the second cache device 225 for storage to obtain the first mirror data. In a specific implementation, the second controller 222 sends the target data to the second home area of one of the first cache device 224 and the second cache device 225 for storage to obtain the first image data. Then, returning to step 510, until it is necessary to store the data in the cache device to the storage device 223, the process proceeds to step 560.

560: The first controller 221 and the second controller 222 store data in the first cache device 224 and the second cache device 225 into the storage device 223.

When the data in the cache device needs to be stored to the storage device 223, for example, when the data in the cache device reaches the threshold, or the host computer 210 instructs to store the data in the cache device to the storage device 223, the first controller 221 The data processed by the first controller 221 in the first cache device 224 and the second cache device 225 is stored in the storage device 223. The second controller 222 also stores the data processed by the second controller 222 in the first cache device 224 and the second cache device 225 into the storage device 223.

It can be understood that if the first cache device 224 has a non-destructive failure, the first controller 221 and the second controller 222 can transfer the data in the first cache device 224 to the second cache device 225. Conversely, if the second When the cache device 225 fails, the first controller 221 and the second controller 222 can transfer the data in the second cache device 225 to the first cache device 224, thereby improving the security of the data.

By implementing the embodiment of the present invention, the cache device can be additionally set and the mirror data is stored in the cache device, so the controller does not need to provide storage space for the mirror data, thereby reducing the requirement on the controller memory size. Moreover, the mirrored data does not need to be transmitted through the PCIe/IB (nfiniband) path, which can alleviate the pressure of data transmission in the PCIe/IB (nfiniband) path. Finally, the load on the controller is reduced. Less, even if one of the controllers has a problem, the controller will not be forced to write data directly to the storage device because the load is too heavy, thus greatly improving the speed of data reading and writing.

Moreover, the first controller cannot write the second home zone that can be written by the second controller, and the second controller cannot write the first home zone that can be written by the first controller, that is, the first controller and the second controller The storage space that the device can perform write operations is independent of each other, which can prevent conflicts caused by two different controllers simultaneously writing to the same storage unit.

Referring to Figure 7, Figure 7 is a flow diagram of another possible implementation of the data storage method of the present invention. This embodiment will be described from the perspective of the storage system shown in FIG. 2. Please understand with reference to FIG. 2, in the embodiment, the data storage method includes the following steps:

610: The host computer 210 selectively transmits the target data to the first controller 221 or the second controller 222.

The host computer 210 can selectively transmit target data to any one of the first controller 221 and the second controller 222. Since one data cannot be processed by both controllers at the same time, the attribution information of the target data is set in the target data, and the controller can determine whether the target data belongs to itself according to the attribution information. If the host computer 210 transmits the target data to the first controller 221. Then, the process proceeds to step 620. If the host computer 210 transmits the target data to the second controller 222, the process proceeds to step 650.

620: The first controller 221 determines whether the target data belongs to the first controller 221 according to the attribution information in the target data.

After receiving the target data, the first controller 221 acquires the home information from the target data, and determines whether it belongs to the first controller 221 according to the target data information. If it belongs to the first controller 221, the process proceeds to step 630; if it does not belong to the first controller 221, it is forwarded to the second controller 222, and proceeds to step 640.

630: The first controller 221 sends the target data to the first cache device 224 for storage to obtain the first image data.

The first controller 221 transmits the target data to the first cache device 224 for storage to obtain the first mirror data. In a specific implementation, the first cache device 224 is provided with a first home zone and a second home zone. The attribute of the first home zone is: the first controller 221 is the first home The genus area can perform a read operation and a write operation, and the second controller 222 can perform a read operation on the first home area but cannot perform a write operation. The attribute of the second home zone is that the second controller 222 can perform a read operation and a write operation on the second home zone, and the first controller 221 can perform a read operation on the second home zone but cannot perform a write operation. Therefore, the first controller 221 transmits the target data to the first home area of the first cache device 224 for storage to obtain the first image data.

640: The first controller 221 sends the target data to the second cache device 225 for storage to obtain the second image data.

The first controller 221 transmits the target data to the second cache device 225 for storage to obtain second mirror data. In a specific embodiment, the first controller 221 sends the target data to the first home area of the second cache device 225 for storage to obtain the second image data. Then, returning to step 610, until it is necessary to store the data in the cache device to the storage device 223, the process proceeds to step 680.

650: The second controller 222 determines, according to the attribution information in the target data, whether the target data belongs to the second controller 222 for processing.

After receiving the target data, the second controller 222 acquires the home information from the target data, and determines whether it belongs to the second controller 222 according to the target data information. If it belongs to the second controller 222, the process proceeds to step 660; if it does not belong to the second controller 222, the target data is forwarded to the first controller 221, and the process proceeds to step 620.

660: The second controller 222 sends the target data to the first cache device 224 for storage to obtain the first image data.

The second controller 222 sends the target data to the first cache device 224 for storage to obtain the first image data. In a specific embodiment, the second controller 222 sends the target data to the second home area of the first cache device 224 for storage to obtain the first image data.

670: The second controller 222 sends the target data to the second cache device 225 for storage to obtain the second image data.

The second controller 222 transmits the target data to the second cache device 225 for storage to obtain second mirror data. In a specific implementation, the second controller 222 sends the target data to the second home area of the second cache device 225 for storage to obtain the second image data. Then, returning to step 610, until it is necessary to store the data in the cache device to the storage device 223, the process proceeds to step 680.

680: The first controller 221 and the second controller 222 will use the first cache device 224 and the second buffer The data in the storage device 225 is stored in the storage device 223.

In this embodiment, after receiving the target data sent by the host computer 210, the first controller 221 sends the target data to the first cache device 224 for storage to obtain the first image data, and the first controller 221 further The target data may be sent to the second cache device 225 for storage to obtain second mirror data. At this time, each of the first cache device 224 and the second cache device 225 has a data, and even if there is a problem with the data in one of the cache devices, the data in the other cache device can be used, thereby greatly improving the data. reliability.

When the first controller 221 fails, the data in the first home zone of the first cache device 224 and the first home zone in the second cache device 225 may be read by the second controller 222 and stored in the storage device. After receiving the data sent by the host computer 210, the second controller 222 may send the data sent by the host computer 210 to the first home zone in the first cache device 224 and the first home zone in the second cache device 225. Store.

It can be understood that if both the first controller 221 and the second controller 222 fail, when the third controller replaces the first controller 221 and the fourth controller replaces the second controller 222, the third controller The first home area of the first cache device 224 and/or the second cache device 225 reads data stored before the first controller 221 fails, and the fourth controller is from the first cache device 224 and/or the second cache device 225 The second home zone reads data stored before the second controller 222 fails to recover the data traffic.

Referring to FIG. 4, in order to further improve the reliability of the data, the cache device 400 (which may be the first cache device or the second cache device described above) may have a power-down protection function. just one When the mirrored data is stored in the first cache device or the second cache device, the first cache device or the second cache device may be correspondingly provided with a power-down protection function. If both the first cache device and the second cache device have one mirror data, the first cache device and the second cache device need to have the power-down protection function.

In order to enable the cache device 400 to have a power-down protection function, in a specific embodiment, the cache device 400 includes a control chip 410, a non-volatile memory 420, and a random access memory 430. The control chip 410 is connected to the non-volatile memory 420, respectively. And a random access memory 430. The part of the non-volatile memory 420 has a storage space as the first space and another part of the storage space as the second space. A part of the storage space of the random access memory 430 is used as the first home area, and a part of the space is used as the second home area.

Referring to FIG. 5, the nonvolatile memory and the random access memory in the cache device 400 may also be replaced by a magnetic random access memory 450, which has both random access memory access speeds. The characteristics of fast speed, and the characteristics of non-volatile memory power-down preservation.

One of ordinary skill in the art can understand that all or part of the process of implementing the foregoing embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The above disclosure is only a preferred embodiment of the present invention, and of course, the scope of the present invention is not limited thereto, and those skilled in the art can understand all or part of the process of implementing the above embodiments, and according to the present invention. The equivalent changes required are still within the scope of the invention.

Claims

A data storage method, comprising: at least two controllers including at least a first controller and a second controller, a storage device, and at least two devices including a first cache device and a second cache device a cache device, the first controller is configured to communicate with the upper computer, and the first controller is further connected to the storage device, the first cache device, and the second cache device, respectively, the second control The second controller is further configured to connect to the storage device, the first cache device, and the second cache device, where the first controller is connected to the second controller, The first cache area is provided with a first home area and a second home area, and the second cache device is provided with a first home area and a second home area.

The attribute of the first home zone is that the first controller can perform a read operation and a write operation on the first home zone in the first cache device and the first home zone in the second cache device. The second controller can perform a read operation on the first home zone in the first cache device and the first home zone in the second cache device, but cannot perform a write operation.

The attribute of the second home zone is: the second controller can perform a read operation and a write operation on the second home zone in the first cache device and the second home zone in the second cache device. The first controller can perform a read operation on the second home area in the first cache device and the second home area in the second cache device, but cannot perform a write operation;

The first controller receives target data sent by the upper computer;

Determining, by the first controller, whether the target data belongs to the first controller according to the attribution information in the target data;

If not, the first controller forwards the target data to the second controller, and if yes, the first controller sends the target data to the first cache device or the The first home area in the second cache device is stored to obtain first image data;

When the data in the cache device needs to be stored in the storage device, the first controller includes the target data in the first home area of the first cache device and the second cache device The data processed by the first controller is stored in the storage device.
The method of claim 1 further comprising:

If the first cache device fails, the first controller and the second controller The controller transfers data in the first cache device to the second cache device.
The method of claim 1 further comprising:

And if the first controller sends the target data to the first cache device to obtain the first mirror data, the first controller further sends the target data to the second cache device Obtaining the second image data.
The method according to any one of claims 1 to 3, wherein when the first controller fails, the second controller modifies a first home zone in the first cache device and The attribute of the first home zone in the second cache device is: the second controller may perform the first home zone in the first cache device and the first home zone in the second cache device. Read and write operations,

The second controller reads data in the first home area of the first cache device and the first home area in the second cache device, and stores the data in the storage device;

After receiving the data sent by the upper computer, the second controller may send the data sent by the upper computer to the first home area in the first cache device and the first home area in the second cache device for storage. .
The method according to any one of claims 1 to 3, wherein if the first controller and the second controller fail, when the third controller replaces the first controller, After the fourth controller replaces the second controller, the third controller reads the first local area from the first cache device and/or the first one of the second cache devices Data stored by the first controller, the fourth controller reads the second controller from a second home zone in the first cache device and/or a second home zone in the second cache device Store data to recover data traffic.
A storage system, comprising: at least two controllers including at least a first controller and a second controller, a storage device, and at least two devices including a first cache device and a second cache device a cache device, the first controller is configured to communicate with a host computer, and the first controller is further connected to the storage device, the first cache device, and the second cache device, respectively, where the second controller is configured And communicating with the upper computer, the second controller is further connected to the storage device, the first cache device, and the second cache device, where the first controller is connected to the second controller. The first cache is set in the first cache device a second home area and a second home area, wherein the second cache device is provided with a first home area and a second home area,

The attribute of the first home zone is that the first controller can perform a read operation and a write operation on the first home zone in the first cache device and the first home zone in the second cache device. The second controller can perform a read operation on the first home zone in the first cache device and the first home zone in the second cache device, but cannot perform a write operation.

The attribute of the second home zone is: the second controller can perform a read operation and a write operation on the second home zone in the first cache device and the second home zone in the second cache device. The first controller can perform a read operation on the second home area in the first cache device and the second home area in the second cache device, but cannot perform a write operation;

The first controller is configured to receive target data sent by the upper computer;

The first controller is configured to determine, according to the attribution information in the target data, whether the target data belongs to the first controller, and if the determination result is no, forwarding the target data to the second control And sending the target data to the first cache area of the first cache device or the second cache device for storage to obtain first mirror data;

The first controller is further configured to: when the data needs to be stored from the cache device to the storage device, include the target data in the first home area of the first cache device and the second cache device The data processed by the first controller is stored in the storage device.
The system of claim 6 wherein:

The first controller and the second controller are configured to transfer data in the first cache device to the second cache device when the first cache device fails.
The system of claim 6 wherein:

The first controller is further configured to send the target data to the second when the first controller sends the target data to the first cache device to obtain the first mirror data. The cache device obtains the second image data.
The system according to any one of claims 6 to 8, wherein when the first controller fails, the second controller modifies the first of the first cache devices An attribute of the first home area and the first one of the second cache devices is: the second controller is the first one of the first cache devices and the first one of the second cache devices The home area can be read and written.

The second controller is configured to read data in the first home area of the first cache device and the first home area in the second cache device, and store the data in the storage device;

The second controller is further configured to: after receiving the data sent by the upper computer, send the data sent by the upper computer to the first home zone in the first cache device and the first home in the second cache device The area is stored.
The system according to any one of claims 6 to 8, wherein a failure occurs in the first controller and the second controller, and when the third controller replaces the first controller, After the four controllers replace the second controller,

The third controller is configured to read data stored by the first controller from a first home zone in the first cache device and/or a first home zone in the second cache device;

The fourth controller is configured to read data stored by the second controller from a second home zone in the first cache device and/or a second home zone in the second cache device to recover data business.