CN104407814A - Method and device for data double writing - Google Patents

Abstract

The embodiment of the invention provides a method and a device for data double writing. The method comprises the following steps of receiving a data double writing request send by a host, and performing data writing on main storage equipment corresponding to a main LUN (logic unit number) and auxiliary storage equipment corresponding to an auxiliary LUN; when the data writing retesting information send by the main storage equipment is received, and the data writing response information returned from the auxiliary storage equipment is received, sending the writing delay information to the host, so as to enable the host to send the data with uncompleted writing to the main storage system; when the data with uncompleted writing sent by the host is not received within the preset time range, using the previously successfully written data of the main storage equipment to cover the latest successfully written data of the auxiliary storage equipment. The method and the device for data double writing provided by the embodiment of the invention have the advantage that the reliability of the storage system is improved.

Description

Method and device for double writing data

technical field

The embodiments of the present invention relate to data backup technology, and in particular to a method and device for double writing data.

Background technique

Double-write data is the data written by the host to the primary storage device corresponding to the main logical unit number (Logical UnitNumber; LUN for short) in the primary storage system, and written to the secondary storage device corresponding to the secondary LUN in the secondary storage system in real time , to ensure that the data in the primary storage system is consistent with the data in the secondary storage system. In applications such as disaster recovery, mirroring, or migration, the reliability of double-write data has a great impact on the system.

At present, when double writing data, if the host receives a return retry command, it means that the primary storage system has timed out writing data. At this time, if the secondary storage system writes data successfully, the data in the primary and secondary storage systems will be inconsistent. In order to solve the above problems, the following two methods are mainly adopted in the prior art: the first method treats the retry instruction as a write error and breaks the data replication relationship between the arrays. The data of the storage system is copied to the secondary storage system to ensure the consistency of the master and slave data. The second method: Ignore the write operation result returned by the primary storage system, return the retried write result to the host, and the host resends the double-write data request, so that the primary storage system and the secondary storage system re-execute the double-write operation to ensure the master-slave storage Consistency of system data.

However, in the first method, when the master storage system reads and writes a large amount of data, there will be frequent disconnection of the inter-array replication business, and the data consistency of the master-slave storage system is guaranteed by starting synchronization; The read/write pressure or the connection between the host and the array link cause the host to fail to retry data writing. Consistent state, so there is a risk of losing data. Therefore, both solutions in the prior art have the problem of low reliability of the storage system.

Contents of the invention

Embodiments of the present invention provide a method and device for double writing data, so as to improve the reliability of a storage system.

In the first aspect, the embodiment of the present invention provides a method for double writing data, including:

Receive the double-write data request sent by the host, and simultaneously write data to the primary storage device corresponding to the primary logical unit number LUN and the secondary storage device corresponding to the secondary LUN;

If the write data retry message sent by the primary storage device is received, and after receiving the write data response message returned from the secondary storage device, then send a write timeout message to the host, so that the host can send a write timeout message to the host The storage system sends the data of the unfinished write operation;

If the data of the incomplete write operation sent by the host is not received within the preset time period, the last successfully written data in the master storage device is used to overwrite the last successfully written data in the slave storage device.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the method further includes:

If the data of the incomplete write operation sent by the host is received within the preset time period, the data write operation will be performed again on the master storage device and the slave storage device.

In combination with the first aspect and the first possible implementation of the first aspect, in the second possible implementation of the first aspect, the double-write data request carries relevant information about the data to be written, and the relevant information including the location and size of the data to be written;

The simultaneous writing of data to the master storage device corresponding to the master logical unit number LUN and the slave storage device corresponding to the slave LUN respectively includes:

According to the location and size of the data to be written, write data to the master storage device and the slave storage device respectively.

With reference to the first aspect, the second possible implementation of the first aspect, in the third possible implementation of the first aspect, the write data retry message carries data information of unfinished write operations;

The use of the last successfully written data in the master storage device to overwrite the last successfully written data in the slave storage device specifically includes:

Obtain the last successfully written data in the primary storage device according to the information of the unfinished write data, and use the last successfully written data in the primary storage device to overwrite the last successfully written data in the secondary storage device .

With reference to the second possible implementation of the first aspect, in the fourth possible implementation of the first aspect, at the same time, the primary storage device corresponding to the primary logical unit number LUN and the secondary storage device corresponding to the secondary LUN After writing data operations separately, it also includes:

If the write data success messages sent by the master storage device and the slave storage device are respectively received, then send a write data success instruction to the host, and delete the relevant information of the data to be written; or,

If the write data success message sent by the master storage device is received, and the write data failure message sent by the slave storage device is received, the write data operation to the slave storage device is interrupted, and the write data success instruction is sent to the host .

With reference to the second possible implementation manner of the first aspect or any of the fourth possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the redistribution to the main storage device and the After the operation of writing data from the storage device, it also includes:

If a rewrite operation completion message sent by the main storage device is received within the preset time period, then delete the information related to the data to be written.

With reference to the second aspect of the first aspect or any of the fourth to fifth possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, the use of the main storage device After the data written successfully in the last time overwrites the data written successfully in the storage device last time, it also includes:

If the write data success message sent from the storage device is received, then delete the relevant information of the data to be written;

Otherwise, interrupt the operation of writing data to the master storage device and the slave storage device again.

In a second aspect, an embodiment of the present invention provides a device for double writing data, including:

The receiving module is used to receive the double-write data request sent by the host;

A processing module, configured to simultaneously write data to the primary storage device corresponding to the primary logical unit number LUN and the secondary storage device corresponding to the secondary LUN;

The sending module is configured to receive, after the receiving module receives the write data retry message sent by the primary storage device, and after receiving the write data response message returned from the secondary storage device, send a write timeout message to the host, to causing the host to send unfinished write operation data to the primary storage system;

The processing module is further configured to, if the receiving module does not receive the data of the unfinished write operation sent by the host within a preset time period, use the last successfully written data in the main storage device to overwrite the The last successfully written data from the storage device.

With reference to the second aspect, in the first possible implementation manner of the second aspect, the processing module is further configured to: if the receiving module receives the data of the unfinished write operation sent by the host within a preset time period , then the operation of writing data to the master storage device and the slave storage device will be performed again.

With reference to the second aspect, the first possible implementation of the second aspect, in the second possible implementation of the second aspect, the double-write data request carries relevant information about the data to be written, and the relevant information including the location and size of the data to be written;

The processing module is also used to:

According to the location and size of the data to be written, write data to the master storage device and the slave storage device respectively.

With reference to the second aspect, the second possible implementation of the second aspect, in the third possible implementation of the second aspect, the write data retry message carries data information of unfinished write operations;

The processing module is also used to:

Obtain the last successfully written data in the primary storage device according to the information of the unfinished write data, and use the last successfully written data in the primary storage device to overwrite the last successfully written data in the secondary storage device .

With reference to the second possible implementation of the second aspect, in a fourth possible implementation of the second aspect, the sending module is further configured to if the receiving module respectively receives the The write data success message sent by the storage device sends a write data success instruction to the host, and the processing module is used to delete the relevant information of the data to be written;

The processing module is further configured to interrupt writing to the slave storage device if the receiving module receives the write data success message sent by the master storage device and receives the write data failure message sent by the slave storage device For data operation, the sending module is used to send a data write success instruction to the host.

In combination with any of the second or fourth possible implementation manners of the second aspect, in a fifth possible implementation manner of the second aspect, the processing module is further configured to:

If the receiving module receives the rewriting operation completion message sent by the main storage device within the preset time period, then delete the information related to the data to be written.

In combination with the second aspect of the second aspect or any of the fourth to fifth possible implementation manners of the second aspect, in a sixth possible implementation manner of the second aspect, the processing module is further configured to:

If the receiving module receives the write data success message sent by the slave storage device, then delete the relevant information of the data to be written; otherwise, interrupt the operation of writing data to the master storage device and the slave storage device again.

The method and device for double-writing data provided by the present invention, by receiving the double-writing data request sent by the host, and simultaneously writing data to the primary storage device corresponding to the primary LUN and the secondary storage device corresponding to the secondary LUN; The system receives the write data retry message sent by the main storage device, and receives the write data response message returned from the storage device, and then sends a write timeout message to the host, so that the host sends unfinished data to the main storage system. If the storage system does not receive the uncompleted write operation data sent by the host within the preset time period, it uses the last successfully written data in the primary storage device to overwrite the last successfully written data in the secondary storage device. By determining that the primary storage system has not received unfinished write operation data within a preset period of time, the data that was successfully written last time in the primary storage device is used to overwrite the data that was successfully written last time in the secondary storage device to ensure that the primary storage device Consistency with the data of the slave storage device avoids the situation of starting synchronization guarantee by frequently disconnecting the business of double-writing data, reduces the risk of data loss, and improves the reliability of the storage system.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic flow diagram of Embodiment 1 of a method for double-writing data in the present invention;

FIG. 2 is a schematic flow diagram of Embodiment 2 of the method for double writing data in the present invention;

3 is a schematic structural diagram of Embodiment 1 of a device for double writing data according to the present invention;

FIG. 4 is a schematic structural diagram of Embodiment 1 of a storage device according to the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The method for double-writing data provided by the embodiments of the present invention can be applied to scenarios such as mirroring attached to a business storage space, a disaster recovery system, migration or replication of data, and the like. Among them, mirroring is a type of redundancy, which is to save an identical copy of data on the primary storage device on the secondary storage device. The disaster recovery system refers to the establishment of two or more sets of IT systems with the same functions in remote places far apart, which can perform normal state monitoring and function switching between each other. When the main end system stops working due to accidents (such as fire, earthquake, etc. At this time, the entire application system can be switched to the slave end, so that the system function can continue to work normally. Migrating or copying data includes copying data from a primary storage device to a secondary storage device or creating a file system backup through a network. It can be seen that in scenarios such as mirroring, disaster recovery systems, migration or copying data, how to improve the reliability of the storage system while ensuring that the data in the primary storage device and the secondary storage device are consistent is a very important question.

FIG. 1 is a schematic flowchart of Embodiment 1 of a method for double writing data in the present invention. An embodiment of the present invention provides a method for double-writing data, which can be executed by any storage system, such as a storage device, a virtualization head, or backup software, and can be specifically implemented by software and/or hardware. As shown in Figure 1, the method of this embodiment may include:

Step 101: Receive a double-write data request sent by the host, and simultaneously perform data write operations on the primary storage device corresponding to the primary LUN and the secondary storage device corresponding to the secondary LUN.

In this embodiment, after receiving the double-write data request sent by the host, the primary storage system simultaneously sends the double-write data request to the primary storage device corresponding to the primary LUN and the secondary storage device corresponding to the secondary LUN, so that the primary storage system The system writes data to the primary storage device and the secondary storage device. Wherein, the storage device may be, for example, a memory, a hard disk, and the like. The present invention is not limited to specific types of storage devices.

Step 102, if the write data retry message sent by the main storage device is received, and after receiving the write data response message returned from the storage device, then send a write timeout message to the host, so that the host sends an unfinished write operation to the main storage system The data.

In this embodiment, each time the primary storage system performs an operation of writing data to the primary storage device and the secondary storage device, the primary storage device and the secondary storage device respectively return a response message to the primary storage system, and the response message is used to indicate Whether the write data is successful this time. After the main storage system receives the write data retry message returned by the main storage device, it waits for the response message returned from the storage device. For each test, the primary storage system sends a write timeout message to the host. After the host receives the write timeout message, it sends the data of the unfinished write operation to the main storage system.

Step 103 , if the data of the incomplete write operation sent by the host is not received within the preset time period, then use the last successfully written data in the primary storage device to overwrite the last successfully written data in the secondary storage device.

In this embodiment, after the main storage system sends a write timeout message to the host, it will start a timer. The last successfully written data in the primary storage device, and use this data to overwrite the last successfully written data in the secondary storage device. For example: after the preset time, the primary storage system does not receive the data A of the incomplete write operation sent by the host, at this time, the last successfully written data in the primary storage device overwrites the last successfully written data in the secondary storage device, In order to ensure that the data in the primary storage device and the secondary storage device are consistent, and can avoid frequent interruption of double-write data operations, and at the same time reduce the pressure of the primary storage system for reading and writing data. Among them, for the slave storage device, if the data writing operation fails this time, the data that was successfully written last time refers to the data that was successfully written last time; if the data writing operation is successful this time, the data that was successfully written last time refers to Data written successfully this time.

In addition, by judging whether the main storage system has received the unfinished write operation data sent by the host within a preset time period, the read and write time delay of the main storage system can be reduced. Among them, the value of the preset time period can be selected according to the experience or the size of the data volume. For example, when the main storage system reads and writes a large amount of data, select 1.5s; when the main storage system reads and writes a small amount of data, select 1s. For the selection of the specific value of the preset time period, this embodiment does not make any special limitation here.

The method for double-writing data provided by the present invention is to receive the double-writing data request sent by the host, and simultaneously write data to the primary storage device corresponding to the primary LUN and the secondary storage device corresponding to the secondary LUN; if the primary storage system receives The main storage device sends the write data retry message, and receives the write data response message returned from the storage device, then sends a write timeout message to the host, so that the host sends the unfinished write operation data to the main storage system, if the main storage system If the data of the unfinished write operation sent by the host is not received within the preset time period, the last successfully written data in the primary storage device is used to overwrite the last successfully written data in the secondary storage device. By determining that the primary storage system has not received unfinished write operation data within a preset period of time, the data that was successfully written last time in the primary storage device is used to overwrite the data that was successfully written last time in the secondary storage device to ensure that the primary storage device Consistency with the data of the slave storage device avoids the situation of starting synchronization guarantee by frequently disconnecting the business of double-writing data, reduces the risk of data loss, and improves the reliability of the storage system.

On the basis of the above method embodiments, if the primary storage system receives the unfinished write operation data sent by the host within the preset time period, it will re-write the data required in the primary storage device to the primary storage device and the secondary storage device. rewritten data. For example: the primary storage system writes data A to the primary storage device and the secondary storage device at the same time. If the data A retry message, it is considered that the data in the primary storage device and the secondary storage device are inconsistent, and at this time, data A is rewritten into the primary storage device and the secondary storage device.

On the basis of the above method embodiments, the double-write data request carries relevant information of the data to be written, wherein the relevant information includes the location and size of the data to be written, so that the main storage system can, according to the location and size of the data to be written, Write data to the master storage device and the slave storage device respectively.

On the basis of the above method embodiments, the write data retry message carries the data information of the uncompleted write operation, so that the primary storage system can retry the uncompleted write operation carried in the message according to the write data returned by the primary storage device Relevant information of the data, determine the data that needs to be rewritten, and mark the data that needs to be rewritten. In addition, after receiving the write timeout message, the host sends the unfinished write operation data to the main storage system. Optionally, when the main storage system receives the unfinished write operation data sent by the host within a preset time period, it will The mark made by the rewritten data is deleted, and at the same time, according to the data of the incomplete write operation sent by the host, the data of the incomplete write operation is rewritten to the main storage device and the slave storage device; when the main storage system is within the preset time period If the data of the incomplete write operation sent by the host is not received, the primary storage system can obtain the last successfully written data in the primary storage device according to the mark, and use this data to overwrite the last successfully written data in the secondary storage device , where the mark includes the position and size of the data of the unfinished write operation.

FIG. 2 is a schematic flowchart of Embodiment 2 of the method for double writing data in the present invention. In this embodiment, on the basis of the first embodiment of the method for double-writing data, a detailed description will be given of an embodiment in which the data writing success message sent by the main storage device is received. As shown in Figure 2, the method of this embodiment may include:

Step 201: Receive a double-write data request sent by the host, and simultaneously perform data write operations on the primary storage device corresponding to the primary LUN and the secondary storage device corresponding to the secondary LUN.

In this embodiment, the double write data request carries the location and size of the data to be written, so that the primary storage system knows which data to write into the primary storage device and the secondary storage device, and according to the location and size of the data to be written, Write data to the primary storage device and the secondary storage device.

Step 202, judging whether to receive a write data retry message sent by the primary storage device.

If yes, step 208 is directly executed after step 203 is executed; otherwise, step 204 is executed.

Step 203: Receive a write data response message returned from the storage device, and send a write timeout message to the host, so that the host sends unfinished data of the write operation to the main storage system.

In this embodiment, if the primary storage system receives the write data retry message sent by the primary storage device, it will wait for the write data response message to be returned from the storage device. After receiving the write data response message returned from the storage device, it will The data information of the incomplete write operation carried in the data retry message marks the data that needs to be rewritten, and starts the retry timer at the same time to judge whether the main storage system can receive the unfinished data sent by the host within the preset time period. Complete the data for the write operation.

Step 204, determine to receive the data writing success message sent by the primary storage device.

Step 205, judging whether to receive a data writing success message sent from the storage device.

If yes, go to step 206; otherwise, go to step 207.

Step 206 , sending a data write success instruction to the host, and deleting the relevant information of the data to be written.

In this embodiment, after the main storage system respectively receives the write data success message sent by the main storage device and the slave storage device, it returns an instruction to the host to write data successfully, and at the same time, deletes the location and size of the data to be written, so that Double write operation of next data.

Step 207, interrupt the data writing operation to the slave storage device, and send a data writing success instruction to the host.

In this embodiment, when the primary storage system receives the write data success message sent by the primary storage device and the write data failure message sent by the secondary storage device, the data of the secondary storage device is not The device continues to write data, and returns an instruction to the host that the data is written successfully, and records the location and size of the data that failed to be written from the storage device.

Step 208, judging whether to receive the data of the unfinished write operation sent by the host within a preset time period.

In this embodiment, by starting a timer, it is judged whether the main storage system receives the unfinished write operation data sent by the host within a preset time period, if yes, execute step 209 , otherwise, execute step 211 .

In step 209, the operation of writing data to the primary storage device and the secondary storage device will be performed again.

In this embodiment, if the primary storage system receives the data of the uncompleted write operation sent by the host within a preset time period, it rewrites the data of the uncompleted write operation into the primary storage device and the secondary storage device.

Step 210, if the rewriting operation completion message sent by the main storage device is received within the preset time period, then delete the relevant information of the data to be written.

In this embodiment, if the master storage device completes the rewriting operation within the preset time period, the data of the master storage device and the slave storage device are the same. At this time, the set timer and the recorded data to be written Relevant information such as location and size are deleted for the next data double-write operation.

Step 211 , use the last successfully written data in the primary storage device to overwrite the last successfully written data in the secondary storage device.

In this embodiment, if the main storage system does not receive the data of the unfinished write operation sent by the host within the preset period of time, then according to the mark made on the data that needs to be rewritten, the last write success in the main storage device is obtained. data, and use the data to overwrite the last successfully written data from the storage device. It can be seen that when the data written by the primary storage device times out, the data consistency of the primary storage device and the secondary storage device can be automatically repaired , avoiding manual intervention and improving the self-healing property of the system.

It should be noted that, if the primary storage system receives the data write failure message sent by the primary storage device, it saves relevant information of the data to be written, and returns a data write failure instruction to the host at the same time.

The method for double-writing data provided by the present invention is to receive the double-writing data request sent by the host, and simultaneously write data to the primary storage device corresponding to the primary LUN and the secondary storage device corresponding to the secondary LUN; if the primary storage system receives The write data retry message sent by the main storage device, and after receiving the write data response message returned from the storage device, sends a write timeout message to the host, so that the host sends the unfinished write operation data to the main storage system. Assuming that the primary storage system does not receive the unfinished write operation data sent by the host within the period of time, the last successfully written data in the primary storage device is used to overwrite the last successfully written data in the secondary storage device. By determining that the primary storage system has not received unfinished write operation data within a preset period of time, the data that was successfully written last time in the primary storage device is used to overwrite the data that was successfully written last time in the secondary storage device to ensure that the primary storage device Consistency with the data of the slave storage device avoids the situation of starting synchronization guarantee by frequently disconnecting the business of double-writing data, reduces the risk of data loss, and improves the reliability of the storage system.

Optionally, on the basis of the above method embodiments, after overwriting the last successfully written data in the secondary storage device with the data that was successfully written last time in the primary storage device, if the write data success message sent from the secondary storage device is received, then Delete the relevant information of the data to be written; otherwise, perform the operation of writing data to the primary storage device and the secondary storage device again.

Specifically, after overwriting the last successfully written data in the secondary storage device with the last successfully written data in the primary storage device, the secondary storage device will return the result of writing data. The system returns a write data retry message, and at the same time deletes relevant information such as the location and size of the recorded data to be written; The operation of writing data between the storage device and the slave storage device is to interrupt the replication relationship between the master storage device and the slave storage device, and record the difference of the written data at the same time, and send the result of the master storage system to write data to the host. In the specific implementation process, the last successfully written data in the primary storage device can be overwritten by the last successfully written data in the secondary storage device by manually starting synchronization, so as to ensure the consistency of the data in the primary storage device and the secondary storage device sex.

FIG. 3 is a schematic structural diagram of Embodiment 1 of the device for double writing data according to the present invention. As shown in FIG.

Among them, the receiving module 301 is used to receive the double write data request sent by the host; the processing module 302 is used to simultaneously write data to the master storage device corresponding to the master logical unit number LUN and the slave storage device corresponding to the slave LUN; the sending module 303 is configured to receive, after the receiving module receives the write data retry message sent by the primary storage device, and after receiving the write data response message returned from the secondary storage device, send a write timeout message to the host, so that all The host sends the data of the incomplete write operation to the main storage system; the processing module 302 is further configured to: if the receiving module does not receive the data of the incomplete write operation sent by the host within a preset time period, then Using the last successfully written data in the master storage device to overwrite the last successfully written data in the slave storage device.

The device for double-writing data provided by the present invention, by receiving the double-writing data request sent by the host, and simultaneously writes data to the primary storage device corresponding to the primary LUN and the secondary storage device corresponding to the secondary LUN; if the primary storage system receives The main storage device sends the write data retry message, and receives the write data response message returned from the storage device, then sends a write timeout message to the host, so that the host sends the unfinished write operation data to the main storage system, if the main storage system If the data of the unfinished write operation sent by the host is not received within the preset time period, the last successfully written data in the primary storage device is used to overwrite the last successfully written data in the secondary storage device. By determining that the primary storage system has not received unfinished write operation data within a preset period of time, the data that was successfully written last time in the primary storage device is used to overwrite the data that was successfully written last time in the secondary storage device to ensure that the primary storage device Consistency with the data of the slave storage device avoids the situation of starting synchronization guarantee by frequently disconnecting the business of double-writing data, reduces the risk of data loss, and improves the reliability of the storage system.

Optionally, the processing module 302 is further configured to re-send data to the master storage device and the slave storage device if the receiving module receives the unfinished write operation data sent by the host within a preset time period. The device performs a data write operation.

Optionally, the double-write data request carries related information of the data to be written, and the related information includes the location and size of the data to be written;

The processing module 302 is also used for:

According to the location and size of the data to be written, write data to the master storage device and the slave storage device respectively.

Optionally, the write data retry message carries data information of unfinished write operations;

The processing module 302 is also used for:

Obtain the last successfully written data in the primary storage device according to the information of the unfinished write data, and use the last successfully written data in the primary storage device to overwrite the last successfully written data in the secondary storage device .

Optionally, the sending module 303 is further configured to send a write data success instruction to the host if the receiving module 301 respectively receives the write data success messages sent by the master storage device and the slave storage device, The processing module 302 is used to delete the relevant information of the data to be written;

The processing module 302 is further configured to: if the receiving module 301 receives the write data success message sent by the master storage device, and receives the write data failure message sent by the slave storage device, then interrupt the data transfer to the slave storage device. In the data writing operation, the sending module 303 is configured to send a data writing success instruction to the host.

Optionally, the processing module 302 is further configured to:

If the receiving module 301 receives the rewrite operation completion message sent by the main storage device within the preset time period, then delete the information related to the data to be written.

Optionally, the processing module 302 is further configured to:

If the receiving module 301 receives the data writing success message sent by the secondary storage device, then delete the relevant information of the data to be written; otherwise, interrupt the operation of writing data to the secondary storage device.

The device for double writing data in this embodiment can be used to implement the technical solution of the method for double writing data provided in any embodiment of the present invention, and its implementation principle and technical effect are similar, and will not be repeated here.

FIG. 4 is a schematic structural diagram of Embodiment 1 of a storage device according to the present invention. As shown in FIG. 4 , the storage device provided in this embodiment includes a receiver 10 , a processor 11 and a transmitter 12 .

Wherein, the receiver 10 is used to receive the double write data request sent by the host, and the processor 11 is used to simultaneously write data to the master storage device corresponding to the master logical unit number LUN and the slave storage device corresponding to the slave LUN; The transmitter 12 is configured to send a write timeout message to the host if the receiver 10 receives the write data retry message sent by the primary storage device, and after receiving the write data response message returned from the storage device, to Make the host send the data of the unfinished write operation to the main storage system; the processor 11 is also configured to if the receiver 10 does not receive the unfinished write operation sent by the host within a preset time period data, use the last successfully written data in the master storage device to overwrite the last successfully written data in the slave storage device.

The storage device provided by the embodiment of the present invention can execute the technical solution of the above method for double writing data, and its implementation principle and technical effect are similar, and will not be repeated here.

In the embodiment of the present invention, the processor 11 is further configured to send data to the main storage device and The slave storage device performs a data write operation.

In the embodiment of the present invention, the double-write data request carries related information of the data to be written, and the related information includes the location and size of the data to be written; the processor 11 is also configured to The position and size of the data are respectively written to the master storage device and the slave storage device.

In the embodiment of the present invention, the write data retry message carries data information of incomplete write operations; the processor 11 is further configured to acquire the Write the data that was successfully written once, and use the data that was successfully written last time in the master storage device to overwrite the data that was successfully written last time in the slave storage device.

In the embodiment of the present invention, the transmitter 12 is further configured to send a write data success message to the host if the receiver 10 respectively receives the write data success message sent by the master storage device and the slave storage device. instruction, the processor 11 is used to delete the relevant information of the data to be written; the processor 11 is also used to if the receiver 10 receives the write data success message sent by the main storage device, and receives the If the write data failure message sent by the slave storage device interrupts the data write operation to the slave storage device, the transmitter 12 is configured to send a write data success instruction to the host.

In the embodiment of the present invention, the processor 11 is configured to delete the data to be written if the receiver 10 receives the rewriting operation completion message sent by the main storage device within the preset time period. Related Information.

In the embodiment of the present invention, the processor 11 is configured to delete the relevant information of the data to be written if the receiver 10 receives the write data success message sent from the storage device; The master storage device and the slave storage device perform data writing operations.

The storage device provided by the embodiment of the present invention can execute the technical solution of the above method for double writing data, and its implementation principle and technical effect are similar, and will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (14)

1. A method of dual write data, comprising:

receiving a double-write data request sent by a host, and simultaneously respectively performing write data operation on a main storage device corresponding to a main Logic Unit Number (LUN) and a slave storage device corresponding to a slave LUN;

if receiving a write data retry message sent by the primary storage device and after receiving a write data response message returned by the secondary storage device, sending a write timeout message to the host, so that the host sends data with uncompleted write operation to the primary storage system;

and if the data of the uncompleted write operation sent by the host computer is not received within a preset time period, overwriting the data successfully written last time in the slave storage equipment by using the data successfully written last time in the master storage equipment.

2. The method of claim 1, further comprising:

and if the data of the uncompleted write operation sent by the host is received within a preset time period, the data writing operation is carried out to the main storage device and the auxiliary storage device again.

3. The method according to claim 1 or 2, wherein the double write data request carries related information of data to be written, and the related information includes a position and a size of the data to be written;

the simultaneously performing data writing operation on the main storage device corresponding to the main logical unit number LUN and the slave storage device corresponding to the slave LUN respectively specifically includes:

and respectively writing data to the main storage device and the auxiliary storage device according to the position and the size of the data to be written.

4. The method of claim 1 or 3, wherein the write data retry message carries information of data of incomplete write operation;

the overwriting the last successful write data in the secondary storage device with the last successful write data in the primary storage device specifically includes:

and acquiring the data successfully written last time in the main storage device according to the information of the data which is not written successfully, and covering the data successfully written last time in the auxiliary storage device with the data successfully written last time in the main storage device.

5. The method according to claim 3, wherein after the simultaneously performing the data writing operation to the master storage device corresponding to the master logical unit number LUN and the slave storage device corresponding to the slave LUN, respectively, further comprises:

if the write data success messages sent by the main storage device and the auxiliary storage device are received respectively, sending a write data success command to the host, and deleting the related information of the data to be written; or,

and if the write data success message sent by the main storage device is received and the write data failure message sent by the auxiliary storage device is received, interrupting the write data operation to the auxiliary storage device and sending a write data success command to the host.

6. The method according to claim 3 or 5, wherein after the operation of writing data to the master storage device and the slave storage device again, the method further comprises:

and if the message of completing the rewriting operation sent by the main storage device is received in the preset time period, deleting the related information of the data to be written.

7. The method according to claim 3, 5 or 6, wherein overwriting the last successful write data in the slave storage device with the last successful write data in the master storage device further comprises:

if the data writing success message sent by the slave storage equipment is received, deleting the related information of the data to be written;

otherwise, the operation of writing data to the master storage device and the slave storage device again is interrupted.

8. An apparatus for dual write data, comprising:

the receiving module is used for receiving a double-write data request sent by a host;

the processing module is used for respectively writing data into the main storage device corresponding to the main logic unit number LUN and the auxiliary storage device corresponding to the auxiliary LUN;

a sending module, configured to send a write timeout message to the host after the receiving module receives a write data retry message sent by the primary storage device and receives a write data response message returned by the secondary storage device, so that the host sends data with incomplete write operations to the primary storage system;

the processing module is further configured to, if the receiving module does not receive the data of the uncompleted write operation sent by the host within a preset time period, overwrite the data successfully written last time in the secondary storage device with the data successfully written last time in the primary storage device.

9. The apparatus of claim 8,

the processing module is further configured to perform a data writing operation to the primary storage device and the secondary storage device again if the receiving module receives the data of the uncompleted write operation sent by the host within a preset time period.

10. The apparatus according to claim 8 or 9, wherein the dual write data request carries related information of data to be written, and the related information includes a position and a size of the data to be written;

the processing module is further configured to:

and respectively writing data to the main storage device and the auxiliary storage device according to the position and the size of the data to be written.

11. The apparatus of claim 8 or 10, wherein the write data retry message carries information of data of an incomplete write operation;

the processing module is further configured to:

and acquiring the data successfully written last time in the main storage device according to the information of the data which is not written successfully, and covering the data successfully written last time in the auxiliary storage device with the data successfully written last time in the main storage device.

12. The apparatus according to claim 10, wherein the sending module is further configured to send a write data success instruction to the host if the receiving module receives write data success messages sent by the master storage device and the slave storage device, respectively, and the processing module is configured to delete the information related to the data to be written;

the processing module is further configured to interrupt a write data operation performed to the slave storage device if the receiving module receives a write data success message sent by the master storage device and receives a write data failure message sent by the slave storage device, and the sending module is configured to send a write data success instruction to the host.

13. The apparatus of claim 10 or 12, wherein the processing module is further configured to:

and if the receiving module receives the message of completing the rewriting operation sent by the main storage device in the preset time period, deleting the related information of the data to be written.

14. The apparatus of claim 10, 12 or 13, wherein the processing module is further configured to:

if the receiving module receives the data writing success message sent by the slave storage device, deleting the relevant information of the data to be written; otherwise, the operation of writing data to the master storage device and the slave storage device again is interrupted.