WO2015058542A1

WO2015058542A1 - Reconstruction method and device for redundant array of independent disks

Info

Publication number: WO2015058542A1
Application number: PCT/CN2014/080499
Authority: WO
Inventors: 梁永贵; 彭书锋
Original assignee: 华为技术有限公司
Priority date: 2013-10-21
Filing date: 2014-06-23
Publication date: 2015-04-30
Also published as: CN103513942A; CN103513942B

Abstract

A reconstruction method and device for a redundant array of independent disks. The method comprises: copying data in a fault disk into a redundant array of independent disks (RAID) to a standby disk in the RAID; and writing degraded data into the standby disk, the degraded data comprising data which needs to be written into the fault disk after the RAID is degraded. The data acquisition rate can be effectively improved, thereby improving the data reconstruction efficiency. In the process of data reconstruction, avoiding reading all the data of other member disks except the fault disk can reduce the I/O pressure of other member disks, so that the influence on normal I/O service is reduced, and thus the overhead of a RAID group system is reduced.

Description

Method and device for reconstructing independent redundant disk array

This application is submitted to the Chinese Patent Office on October 21, 2013, and the application number is

201310496672.1, the entire disclosure of which is hereby incorporated by reference in its entirety in its entirety in its entirety in its entirety in the the the the the the the the the the

TECHNICAL FIELD Embodiments of the present invention relate to communication technologies, and in particular, to a method and an apparatus for reconstructing an independent redundant disk array. BACKGROUND OF THE INVENTION With the rapid development of computer technology and network technology, the memory that comes with the computer is gradually difficult to meet the requirements of fast access speed, large storage capacity, and low cost, so that a relatively independent storage system is developed. A storage system usually consists of a storage device such as a storage server. It has its own interface and protocol. It is connected to the host computer through a coaxial cable, network cable, or optical fiber. The storage center serves as a storage center for the computer.

Redundant Array of Independent Disks (RAID) is a method of storing the same data in different places on multiple hard disks. Figure 1 is a schematic diagram of the structure of RAID 5. As shown in Figure 1, four disks form a RAID5, all the disks are striped according to the length of the logical block address (LBA). The length of the LBA is called the stripe depth. Each disk in the disk group is combined with the strips at the same position. It is called a stripe of the RAID group. As shown in Figure 1, D0, Dl, D2 and PI are combined into one RAID stripe. One stripe in the RAID group strip is used as the check area, and the other strips are used as the data area. As shown in Figure 1, D0, Dl, and D2 are the data areas, and P1 is the check area. The data sent by the upper application is stored in the data area, and XOR is performed between all the strips in the data strip as a data area. The operation, the operation data is recorded as the data of the stripe check area, gp : Pl = D0 xor Dl xor D2. When any one of the four disks fails, the data in the failed disk can be obtained by XORing all the data of the other disks. For example, when the first disk fails, the data above it is DO = Dl xor D2 xor PI ; D3 = D5 xor D4 xor P2 , this process is called RAID reconfiguration, and the reconstructed data is written to another empty disk, thus ensuring that data is not lost. However, with the development of storage technology, the capacity of a single disk is getting larger and larger, but the performance of a single disk is less improved, resulting in longer and longer reconstruction time. In the reconstruction, other member disks in the RAID group must continue to assume normal. The input/output (I/O) of the service has to bear additional reconfiguration I/O, which makes the disk pressure higher, resulting in a higher disk failure rate. Summary of the invention

The embodiment of the invention provides a method and a device for reconfiguring an independent redundant disk array, which is used to improve the RAID reconstruction efficiency, reduce the pressure of the member disks other than the failed disk in the RAID group, and reduce the impact on the normal service 10. .

A first aspect of the present invention provides a method for reconfiguring an independent redundant disk array, including: performing a copy process of data on a failed disk in an independent redundant disk array RAID to a spare disk in the RAID;

The degraded data is written to the spare disk, and the degraded data includes data that needs to be written to the failed disk after the RAID is degraded and before the copy processing is completed.

In a first possible implementation manner of the first aspect, the performing the independent redundant disk array

Before the data on the failed disk in the RAID is processed to the copy on the spare disk in the RAID, it also includes:

After the faulty disk is powered off, the power is re-powered.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, before the degrading data is written to the spare disk, the method further includes: Determining the degraded data in the memory of the controller in the RAID according to the time sequence of the degraded data writing;

Writing the degraded data to the spare disk includes:

The degraded data in the memory is written to the spare disk in the order of the number of the stripe and the time the degraded data is written.

According to a second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the step of writing the degraded data according to a stripe of the faulty disk Recording the degraded data in the memory of the controller in the RAID, including:

If it is determined that the first data needs to be written into the first strip in the faulty disk, determining whether the degraded data of the first stripe is recorded in the memory; If yes, updating the degraded data of the first strip according to the first data; if not, determining whether the copy processing is completed;

If yes, writing the first data to the spare disk;

If not, the number of the first strip and the first data are recorded in the memory. With reference to the first aspect, or any one of the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, Determining that there is a bad track in the second strip in the faulty disk during the copying process, and reading a component in the member disk other than the faulty disk in the RAID and the second stripe component Second data in the strip of strips;

Performing an exclusive OR operation between the second data to obtain third data;

The third data is written to the spare disk.

A second aspect of the present invention provides a reconfigurable apparatus for an independent redundant disk array, including: a processing module, configured to execute data on a failed disk in an independent redundant disk array RAID to a copy of the spare disk in the RAID deal with;

And a write module, configured to write the degraded data to the spare disk, where the degraded data includes data that needs to be written to the failed disk after the RAID is degraded and before the copy processing is completed.

In a first possible implementation manner of the second aspect, the processing module is further configured to: perform, on the failed disk in the independent redundant disk array RAID, a copy of the data on the spare disk in the RAID Before the processing, after the power supply to the faulty disk is stopped, the power is re-powered.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the processing module is further configured to: write the degraded data into the standby Before the disk, the degraded data is recorded in the memory of the controller in the RAID according to the time sequence of the degraded data writing in units of strips of the failed disk;

The writing module is further configured to:

According to a second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the processing module is further configured to:

If yes, writing the first data to the spare disk;

If not, the number of the first strip and the first data are recorded in the memory. With reference to the second aspect, or any one of the first to the third possible implementation manners of the second aspect, in a fourth possible implementation manner of the second aspect, the processing module is further configured to execute In the process of copy processing, if it is determined that there is a bad track in the second strip in the faulty disk during the copy processing, reading the member disks in the RAID other than the faulty disk The second strip constitutes second data in the strip of the strip;

The third data is written to the spare disk.

The method and device for reconfiguring the independent redundant disk array provided by the embodiment of the present invention, by performing the copy processing of the data on the failed disk in the RAID to the spare disk in the RAID, and then writing the degraded data to the spare disk, the degradation data includes After the RAID is degraded, the data of the failed disk needs to be written, which can effectively improve the data acquisition rate and improve the data reconstruction efficiency. In the data reconstruction process, the entire data read area of the member disks other than the failed disk can be avoided, and other data can be reduced. The I/O pressure of the member disk reduces the impact on the normal service I/O, which reduces the overhead of the RAID group system, and avoids the bad sectors on the other member disks in the reconfiguration. The data cannot be reconstructed. Construct the validity and integrity of the data and reduce the impact on business applications. DRAWINGS

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

Figure 1 is a schematic structural view of a RAID 5;

2 is a flowchart of Embodiment 1 of a method for reconstructing an independent redundant disk array according to the present invention; FIG. 3 is a flowchart of Embodiment 2 of a method for reconstructing an independent redundant disk array according to the present invention; The schematic diagram of the degraded data recorded in the second embodiment of the method for reconstructing the independent redundant disk array provided by the invention; 4B is a flowchart of recording degraded data in Embodiment 2 of a method for reconstructing an independent redundant disk array according to the present invention;

5 is a flowchart of Embodiment 3 of a method for reconstructing an independent redundant disk array according to the present invention; FIG. 6 is a schematic structural diagram of Embodiment 1 of a device for reconstructing an independent redundant disk array according to the present invention;

FIG. 7 is a schematic structural diagram of Embodiment 2 of a reconfigurable apparatus for an independent redundant disk array according to 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 a partial embodiment of the invention, and not all of the 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.

2 is a flowchart of Embodiment 1 of a method for reconfiguring an independent redundant disk array according to the present invention. As shown in FIG. 2, the method for reconstructing an independent redundant disk array in this embodiment includes:

5101. Perform the copy processing of the data on the failed disk in the RAID to the spare disk in the RAID.

The execution body of this embodiment may be a reconstruction device of an independent redundant disk array, and the reconstruction device of the independent redundant disk array may be included in the controller of the RAID group.

Specifically, the scenario in this embodiment may be that the disk in the RAID group fails, and the data in the fault disk is reconstructed.

In an embodiment of the present invention, before S101, the method may further include:

After the failed disk is powered off, re-power it.

Specifically, from the current disk fault condition, after the faulty disk is powered on and off again, the faulty disk can be used again, but the health state of the disk is seriously degraded, and the probability of recurring the fault is extremely high. After the failed disk is powered on and off, the data on the failed disk in the RAID is processed to the copy of the spare disk in the RAID.

5102. Write the degraded data to the spare disk, and the degraded data includes data that needs to be written to the failed disk after the RAID is degraded and before the copy processing is completed. Specifically, in the embodiment, the reconfigurable device of the independent redundant disk array records the RAID group as a degraded state after the disk in the RAID group fails. After the RAID group is degraded, the data can be received as the normal time of the RAID group. After the RAID is demoted, before the copy processing is completed, new data that needs to be written to the failed disk is written to the spare disk, so that the data in the spare disk is restored to the latest state.

For example, the reconstruction method of the independent redundant disk array of the embodiment can be applied to other levels of RAID, such as RAID6 and RAID50, in addition to the RAID5.

In this embodiment, after the disk in the RAID group fails, the data on the failed disk in the RAID is copied to the backup disk in the RAID, and the degraded data is written to the spare disk. The downgraded data is required after the RAID is degraded. The data in the faulty disk is reconstructed by writing data of the faulty disk, and the data in the faulty disk is obtained by XORing all the data of the disk other than the faulty disk. By performing data copy processing of the failed disk to the spare disk, the data acquisition rate can be effectively improved, the data reconstruction efficiency can be improved, and the entire data read area of the member disks other than the failed disk can be avoided during the data reconstruction process, and the other data can be reduced. The I/O pressure of the member disk reduces the impact on the normal service I/O, thereby reducing the overhead of the RAID group system. Moreover, in the data reconstruction, the member disk other than the failed disk appears in the data reconstruction. Bad sectors can't reconstruct valid data and can only mark bad sectors of disks, even RAID groups The final reconfiguration is completed, but the data of the bad sectors marked by the disk is invalid. If the bad track mark area of the disk is the file system key area data, the operating system reports that the file system is damaged, the service is interrupted, and the embodiment directly copies The data on the faulty disk avoids the bad sectors on the other member disks in the reconfiguration and the data cannot be reconstructed. This ensures the validity and integrity of the reconstructed data and reduces the impact on the service application.

The method for reconfiguring the independent redundant disk array of the embodiment is performed by performing the copy processing of the data on the failed disk in the RAID to the spare disk in the RAID, and then writing the degraded data to the spare disk, and the downgraded data is included after the RAID is degraded. Before the copy processing is completed, the data of the failed disk needs to be written, which can effectively improve the data acquisition rate and improve the data reconstruction efficiency. During the data reconstruction process, the entire data read area of the member disks other than the failed disk can be avoided. Reduce the I/O pressure of other member disks, reduce the impact on normal service I/O, and reduce the overhead of the RAID group system, and avoid the bad sectors on other member disks in the reconstruction process, so that the data cannot be reconstructed. Ensure the effectiveness and integrity of the reconstructed data and reduce the impact on business applications. 3 is a flowchart of Embodiment 2 of a method for reconfiguring an independent redundant disk array according to the present invention. As shown in FIG. 3, the method for reconstructing an independent redundant disk array in this embodiment records degraded data into a RAID control. In the memory of the device, it can include:

S201. After powering off the faulty disk, re-power.

S202. Perform a copy processing of the data on the failed disk in the RAID to the spare disk in the RAID.

S203: Record the degraded data in the memory of the controller in the RAID according to the time sequence of the degraded data in the stripe of the faulty disk.

Specifically, in the data reconstruction process, the amount of data change on a single disk in the RAID group is limited, so the data that needs to be written to the failed disk can be recorded as a bitmap after the failure of the RAID group and before the copy processing is completed. In the memory of the controller in the RAID, and after the copy processing is completed, the degraded data recorded in the memory is written to the spare disk.

It can be understood that recording the degraded data in the memory of the controller in the RAID is a possible implementation. Other possible degraded data recording locations, such as dedicated memory, can also be used to implement the embodiment. Not limited.

4A is a schematic diagram of degraded data recorded in Embodiment 2 of a method for reconfiguring an independent redundant disk array according to the present invention. As shown in FIG. 4A, a record of a faulty disk is recorded in units of a stripe number of the failed disk. The physical start address (P) and data length (LEN) of the data are recorded in chronological order in the form of a linked list for multiple data modifications on the same stripe.

FIG. 4B is a flowchart of recording the degradation data in the second embodiment of the method for reconfiguring the independent redundant disk array according to the present invention. As shown in FIG. 4B, the process of recording the degradation data in this embodiment may include:

S301. Determine whether the first data written in the RAID group needs to be written into the first strip in the faulty disk. If yes, execute S302. Otherwise, execute S307.

5302. Determine whether the degraded data of the first strip is recorded in the memory. If yes, execute S303. Otherwise, execute S304.

5303. Update the degraded data of the first strip according to the first data.

5304. Determine whether the copy processing is completed. If yes, execute S305. Otherwise, execute S306.

5305. Write the first data to the spare disk.

5306. Record the number and the first data of the first strip in the memory.

S307. Write the first data to a member disk other than the faulty disk. Specifically, if the degraded data of the first strip is recorded in the memory, the first data is recorded after the degraded data of the first strip according to the time sequence of data writing, otherwise, it is determined whether the copy processing is completed, if , the first data is directly written to the spare disk, and does not need to be recorded in the memory; if not, it indicates that there is no record in the memory that needs to write the first stripe, and the first stripe is recorded in the memory. Number and first data.

S204. Write the degraded data in the memory to the spare disk according to the number of the stripe and the time sequence of the degraded data write.

Specifically, since the time sequence of the degraded data record into the memory is different, the degraded data in the memory needs to be written to the spare disk in the order of the stripe number and the degraded data write time.

The method for reconfiguring the independent redundant disk array of the embodiment is performed by performing the copy processing of the data on the failed disk in the RAID to the backup disk in the RAID, and the time of writing the data according to the degraded data in units of the strips of the failed disk. The degraded data is recorded in the memory of the controller in the RAID, and the degraded data in the memory is written to the spare disk in the order of the stripe number and the degraded data write time, which can effectively improve the data acquisition rate and improve data reconstruction. Efficiency, avoiding the full data read area of other member disks except the failed disk during data reconstruction, which can reduce the I/O pressure of other member disks, reduce the impact on normal service I/O, and thus reduce the RAID group. The overhead of the system, and can avoid the bad sectors on other member disks in the reconstruction, so that the data cannot be reconstructed, ensuring the validity and integrity of the reconstructed data, and reducing the impact on the business application.

FIG. 5 is a flowchart of Embodiment 3 of a method for reconfiguring an independent redundant disk array according to the present invention. As shown in FIG. 5, the method for reconstructing an independent redundant disk array in this embodiment is in a faulty disk during the reconstruction process. The description of the scenario in which the strip has failed includes:

5401. After the faulty disk is powered off, re-power it.

5402. Perform a copy processing of the data on the failed disk in the RAID to the spare disk in the RAID.

S403. Determine whether there is a bad track in the second strip in the faulty disk during the execution of the copy processing, and if yes, execute S404; otherwise, execute S405.

S404. The second data in the stripe of the member disk other than the faulty disk in the RAID and the second stripe is read, and the XOR operation is performed between the second data to obtain the third data. Three data is written to the spare disk.

S405. The copy processing is completed. Specifically, after the copy processing is completed, the state of the RAID group can be recorded as a state of completion of reconstruction.

S406. Write the recorded degraded data brush to the spare disk.

Specifically, after the recorded degraded data is written to the spare disk, the RAID group status can be adjusted to the reconfiguration completion state, and the alarm is reported to the customer to replace the failed disk.

The method for reconstructing the independent redundant disk array of the embodiment, by performing the copy processing of the data on the failed disk in the RAID to the spare disk in the RAID, if determining the second item in the failed disk during the copy processing If there is a bad track in the band, the second data in the stripe of the member disk other than the faulty disk in the RAID and the second stripe is read; the XOR operation is performed between the second data to obtain the first The third data is written to the spare disk, which can effectively improve the data acquisition rate and improve the data reconstruction efficiency. In the data reconstruction process, the entire data read area of the member disks other than the failed disk can be avoided, and other data can be reduced. The I/O pressure of the member disk reduces the impact on the normal service I/O, which reduces the overhead of the RAID group system, and avoids the bad sectors on the other member disks in the reconfiguration. The data cannot be reconstructed. Construct the validity and integrity of the data and reduce the impact on business applications.

FIG. 6 is a schematic structural diagram of Embodiment 1 of an apparatus for reconfiguring an independent redundant disk array according to the present invention. As shown in FIG. 6, the apparatus for reconfiguring an independent redundant disk array of the present embodiment may include: a processing module 61 and The writing module 62 is configured to perform the copy processing of the data on the failed disk in the RAID to the spare disk in the RAID; the writing module 62 is configured to write the degraded data to the spare disk, and the degraded data is included in the RAID. After the downgrade, the data of the failed disk needs to be written before the copy processing is completed.

In one embodiment of the present invention, the processing module 61 is further configured to re-power the failed disk after powering down the data on the failed disk in the RAID to the backup disk on the spare disk in the RAID.

The device in this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 2, and the principle and the technical effect are similar, and details are not described herein again.

In an embodiment of the present invention, the processing module 61 is further configured to record the degraded data in the RAID in the time sequence of the degraded data before the degraded data is written to the spare disk. In the memory of the device;

The write module 62 is also used to: The degraded data in memory is written to the spare disk in the order in which the stripe number is written and the degraded data is written.

In an embodiment of the invention, the processing module 61 is further configured to:

If it is determined that the first data needs to be written into the first strip in the faulty disk, it is determined whether the degraded data of the first stripe is recorded in the memory;

If yes, updating the degraded data of the first strip according to the first data;

If not, it is determined whether the copy processing is completed;

If yes, the first data is written to the spare disk;

If not, the number of the first strip and the first data are recorded in the memory.

The device in this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 3, and the principle and the technical effect are similar, and details are not described herein again.

In an embodiment of the present invention, the processing module 61 is further configured to: in the process of performing the copy processing, if it is determined that there is a bad track in the second strip in the faulty disk during the copy processing, the fault is read in the read RAID. a second data in a strip of the member disk other than the disk and the second stripe;

Write the third data to the spare disk.

The device in this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 5. The principle and the technical effect are similar, and details are not described herein again.

FIG. 7 is a schematic structural diagram of Embodiment 2 of an apparatus for reconfiguring an independent redundant disk array according to the present invention. As shown in FIG. 7, the apparatus for reconstructing an independent redundant disk array of the present embodiment may include: at least one bus 71 At least one processor 72 connected to the bus 71 and at least one memory 73 connected to the bus 71, wherein the processor 72 calls the code stored in the memory 73 via the bus 71 for:

Performing copy processing of the data on the failed disk in the independent redundant disk array RAID to the spare disk in the RAID;

The degraded data is written to the spare disk, and the downgraded data includes data that needs to be written to the failed disk after the RAID is degraded and before the copy processing is completed.

The device of this embodiment may be used to perform any one of the technical solutions of the method embodiment shown in FIG. 2, FIG. 3 or FIG. 5, and the implementation principle and technical effects are similar, and details are not described herein again. It should be noted that the corresponding structural diagrams of the foregoing embodiments are merely illustrative, and the connection relationship of each part or module is not limited to the form shown in the figure, and may be subject to the actual application.

In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the method of various embodiments of the present invention. Partially. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and the like, which can store program codes. .

A person skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed, that is, the device is installed. The internal structure is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the device described above, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, and not The invention is described in detail with reference to the foregoing embodiments, and those skilled in the art should understand that the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be modified. The equivalents are made without departing from the scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

1. A method for reconstructing an independent redundant disk array, which is characterized by including:

Perform copy processing of data on the failed disk in the independent redundant disk array RAID to the spare disk in the RAID;

Write degraded data to the spare disk, where the degraded data includes data that needs to be written to the failed disk after the RAID is degraded and before the copy processing is completed.

2. The method according to claim 1, characterized in that the step of copying the data on the failed disk in the independent redundant disk array RAID to the spare disk in the RAID also includes:

After powering off the faulty disk, power it again.

3. The method according to claim 1 or 2, characterized in that, before writing the downgraded data to the spare disk, it further includes:

Taking the stripe of the failed disk as a unit, the degraded data is recorded in the memory of the controller in the RAID according to the time sequence in which the degraded data is written;

The degraded data is written to the spare disk, including:

The degraded data in the memory is written to the spare disk in the order of the stripe number and the writing time of the degraded data.

4. The method according to claim 3, characterized in that, based on the stripe of the failed disk as a unit, the degraded data is recorded in the RAID control according to the time sequence of writing the degraded data. The memory of the processor includes:

If it is determined that the first data needs to be written to the first strip in the failed disk, determine whether the degraded data of the first strip is recorded in the memory;

If so, update the degraded data of the first strip according to the first data;

If not, determine whether the copy processing is completed;

If so, write the first data to the spare disk;

If not, record the number of the first strip and the first data in the memory.

5. The method according to claims 1-4, characterized in that, during the copy processing, if it is determined that bad sectors exist in the second strip of the failed disk during the copy processing, , then read the second data in the stripe that forms the stripe with the second stripe in the member disks in the RAID except the faulty disk; Perform an XOR operation between the second data to obtain the third data;

The third data is written to the spare disk.

6. A reconstruction device for an independent redundant disk array, characterized by including:

A processing module, used to perform copy processing of data on the failed disk in the independent redundant disk array RAID to the spare disk in the RAID;

A writing module, configured to write degraded data to the spare disk, where the degraded data includes data that needs to be written to the failed disk after the RAID is degraded and before the copy processing is completed.

7. The device according to claim 6, wherein the processing module is further configured to transfer data from a failed disk in an independent redundant disk array RAID to a spare disk in the RAID. Before the copy process, power supply to the faulty disk is stopped, and then power is supplied again.

8. The device according to claim 6 or 7, wherein the processing module is further configured to, before writing the degraded data to the spare disk, take the stripe of the failed disk as a unit, Record the degraded data in the memory of the controller in the RAID according to the time sequence in which the degraded data is written;

The writing module is also used for:

9. The device according to claim 8, wherein the processing module is further configured to: if it is determined that the first data needs to be written to the first stripe in the faulty disk, determine whether the first stripe in the memory is The degradation data of the first strip is recorded;

If so, update the degraded data of the first strip according to the first data;

If not, determine whether the copy processing is completed;

If so, write the first data to the spare disk;

If not, record the number of the first strip and the first data in the memory.

10. The device according to claims 6-9, characterized in that the processing module is further configured to, during the execution of the copy processing, if it is determined that the faulty disk in the failed disk is If there are bad sectors in the second strip, read the second data in the strips in the member disks in the RAID other than the faulty disk that form a stripe with the second strip;

Perform an XOR operation between the second data to obtain the third data;

The third data is written to the spare disk.