JP2002373059A - Disk array error recovery method, disk array control device and disk array device - Google Patents

Abstract

(57) [Summary] Even if a disk array is closed due to multiple failures of a disk drive, the disk array can be easily restored to a usable state. When a plurality of HDDs in a disk array are shut down due to a failure of a plurality of HDDs, a microprocessor in the disk array controller stores RAID configuration information in a current table immediately before the blockage in a recovery table. After the array is closed, the RAID configuration information on the current table 126b is updated to reflect the state of the array after the block. When a recovery request is given by the user operating the operation panel 128, the microprocessor 125
Reads the RAID configuration information of the specified disk array 11-i from the recovery table 126a, returns the array 11-i to the state immediately before the blockage according to the information, and overwrites the information on the current table 126b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a RAID (Redundant
The present invention relates to a disk array device having an ant Arrays of Inexpensive Disks configuration, and in particular, to recover an error of a disk array suitable for recovering the disk array to a usable state when a plurality of disk drives of a member constituting the disk array fail. The present invention relates to a method, a disk array control device, and a disk array device.

[0002]

2. Description of the Related Art Generally, a disk array device includes a plurality of disk drives, for example, a magnetic disk drive (hereinafter, referred to as a magnetic disk drive).
HDDs), and a disk array controller that controls access to each HDD (member HDD) in the disk array.

A disk array device is known as an external storage device having the following two features. The first feature is that the reading / writing of data requested from the file system on the host computer is executed in a distributed manner by moving the HDDs in the disk array in parallel to speed up access. It is. The second feature is
The point is that reliability is improved by making data redundant.

The disk array controller generates redundant data as data correction information for write data transferred from the host computer. The disk array controller transmits the redundant data to a plurality of Hs in the disk array.
Write to any one of DD. Thus, when one of the plurality of HDDs fails, the failed HDD is used by using the redundant data and the data of the remaining normal HDDs.
The data of D can be restored.

As one of data redundancy techniques, RAI is used.
The D method is known. The RAID method is classified into various RAID levels in relation to RAID data and redundant data. Representative RAID levels include Level 3 and Level 5.

At level 3 (RAID level 3), the disk array controller divides update data (write data) transferred from the host computer and performs an exclusive OR operation between the divided update data. This generates parity data as redundant data. The disk array control device updates the original parity data written in any of the plurality of HDDs with the parity data. On the other hand, at level 5 (RAID level 5), the disk array control device updates data (new data) transferred from the host computer and updates the data before updating stored in the HDD area where the update data is stored Data (old data) and another HDD corresponding to the storage location of the update data
The updated parity data (new parity data) is generated by performing an exclusive OR operation with the pre-updated parity data (old parity data) stored in the area. The disk array controller updates the original parity data with the new parity data.

In the disk array device having such a RAID configuration, when a member HDD in the disk array fails, data of the failed HDD is restored as follows. First, the disk array control device reads data from each HDD other than the failed HDD for each stripe which is a unit for managing the disk area of the disk array. The disk array control device obtains restored (restored) data by performing an exclusive OR operation on the data read from each HDD. The method using the exclusive OR operation, that is, the method including the data restoration using the consistency between the RAID data and the parity data (redundant data) is the RAID method. The disk array control device uses the RAID method to acquire the restored data for each stripe, thereby restoring the data in all areas of the failed HDD in the HDD used in place of the failed HDD. be able to. This failed H
The HDD used in place of the DD is an HDD used in place of the failed HDD, or a spare HDD which is connected to the disk control device in advance and is assigned as a substitute for the failed HDD.

As described above, in a disk array device having a RAID configuration, even if a member HDD in the disk array fails, data of the failed HDD can be restored to the original.

However, when a plurality of member HDDs fail in the same disk array, that is, when multiple HDD failures occur, the user data cannot be restored by utilizing RAID data redundancy. That is, when multiple failures occur in the HDD, the user data cannot be restored by the RAID method. In this case, a failure occurs in the entire disk array, the array is closed, and data in the array cannot be accessed.

[0010] When the disk array is blocked as described above, conventionally, all failed HDDs are replaced and the state of the disk array is initialized again, and then the tape array or the like from which data has been separately backed up is read from the array. It was common to write data back to.

[0011]

As described above, the RA
In the conventional disk array device having the ID configuration, when the disk array is closed, all the failed HDDs are replaced, the state of the disk array is initialized again, and then the data is backed up from a tape device or the like from which data was backed up. Data had to be written back to the array.

However, since writing back from the tape device requires a long time, there is a problem that the system is stopped during that time. Also, if there was no data backup, enormous amount of time and effort was required to restore the system. Further, even when data is backed up, it takes a long time to write back from the tape device, and there is a problem that the system is stopped during that time.

The present invention has been made in view of the above circumstances, and has as its object to provide a method for temporarily or partially HDD failure even if the disk array is closed due to multiple failures of a disk drive in the same disk array. A disk array error recovery method, a disk array control device, and a disk array device that can easily recover the disk array to a usable state in response to an external request. It is in.

[0014]

A disk array error recovery method according to the present invention includes at least one disk array in a RAID configuration composed of a plurality of disk drives and at least the configuration and operation of a current disk array. RAID configuration information indicating the status (first R
AID configuration information) is stored in a non-volatile current storage area (first storage area), and when the disk array is closed, the recovery R of the disk array immediately before the block is closed.
An error recovery method for a disk array in a disk array device in which a recovery storage area (second storage area) for storing AID configuration information (second RAID configuration information) is provided, wherein the disk array is configured. When at least two disk drives out of a plurality of disk drives fail, when the disk array is closed, the RAID configuration information immediately before the disk array is closed and stored in the current storage area is used as the recovery RAID configuration. The information is stored in the recovery storage area, and after the disk array is closed, the RAID configuration information in the current storage area of the disk array is updated to reflect the state after the disk array is closed, and the closed state is set. To recover the disk array on the server to a usable state When the request is given by a user operation, the recovery RAID configuration information immediately before the blockage of the disk array to be recovered is read from the recovery storage area, and the disk array to be recovered is blocked based on the RAID configuration information. It is characterized by forcibly returning to the immediately preceding state and overwriting the recovery RAID configuration information in the current storage area.

As described above, according to the present invention, when a plurality of disk drives in a disk array fail (that is, multiple failures of the disk drives) and the array is blocked, the RAID configuration information immediately before the blockage is restored to the recovery RAID.
The configuration information is stored in the recovery storage area, and after the array is closed, the RAID configuration information in the current storage area is updated to reflect the state of the array after the block. Then, when a recovery request for the blocked disk array is given by a user operation,
The recovery RAID configuration information is read and the
According to the ID configuration information, the specified disk array is forcibly returned to the configuration or operating state immediately before the blockage, and the RAI
The D configuration information is overwritten on the current storage area.

Thus, even if the corresponding disk array is blocked due to multiple failures of the disk drive, it is necessary to urgently resume the operation of the array, or to read only important data from the array and make a backup. For example, when a recovery request is given by a user operation for a reason such as a trouble, a failure of the disk drive is recovered by turning off / on the power of the drive or removing and inserting a module. If so, the array can be easily restored to a usable state.

[0017] In addition to the above-mentioned transient faults, disk drive faults include faults that occur only in a partial area (partial faults), for example, media errors. If the disk drive failure is related to a media error, the sector block in which the media error occurred is replaced with a replacement sector block, and the specified disk array is forced to the configuration and operating state immediately before the blockage. It is preferable to perform a recovery process for returning to a normal state. for that purpose,
When the disk array is closed, information indicating the cause of the blockage of the disk array is also stored in the recovery storage area in addition to the RAID configuration information, and the information indicating the cause of the blockage is also included in the recovery processing of the disk array. Simultaneously read, determine whether the cause of the blockage is a media error, and if a media error occurs, replace the sector block in which the media error has occurred with the replacement sector block as described above, and then recover Processing should be performed.

By doing so, most of the user data in the disk array is recovered, and the operation of the system can be continued.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a disk array device according to an embodiment of the present invention.

In FIG. 1, a disk array device 10
Controls at least one disk array, for example, two disk arrays 11-1 (# 1) and 11-2 (# 2) and the disk arrays 11-1 (# 1) and 11-2 (# 2). And a disk array control device 12.

Each of the disk arrays 11-1 and 11-2 has a plurality of HDDs (magnetic disk drives), for example, 5 HDDs.
HDD (member HDD) 111.

The disk array controller 12 includes a plurality of interface controllers 121 for connecting to a host computer 20 using the disk array apparatus 10 via an interface 21, and disk arrays 11-1 and 11
, The same number of interface controllers 122 for connecting to the HDDs 111 constituting the HDD-2 via the interface 22, the host computer 20 and the disk array device 10
A buffer memory 123 for temporarily storing data transferred between the
The data bus 124 is used for data transfer between the buffer memories 21 and 122 and the buffer memory 123. The interfaces 21 and 22 are, for example, SCSI (Small
Computer System Interface) or Fiber Channel (FibreChannel). The buffer memory 123
The disk array includes a disk cache in which a copy of a part of data of the disk arrays 11-1 and 11-2 is held. The data bus 124 is, for example, a PCI (Peripheral Component Int.)
erconnect Bus).

The disk array controller 12 also forms a main controller of the controller 12, and includes a microprocessor 125 for controlling the entire controller 12 and the disk arrays 11-1 and 11-2. A nonvolatile memory in which a control program to be executed is stored, for example, a flash memory 126;
A volatile memory, for example, a RAM 127, which provides 25 work areas and the like, and an operation panel 128 used for displaying a status of the disk array control device 12, inputting an instruction to the disk array control device 12 by a user operation, and the like.

The flash memory 126 has two tables, a recovery table 126a and a current table 126b. When the disk array 11-i is closed, the recovery table 126a stores
Used to save information about returning -i to a usable state. This information includes the RAID configuration information of the disk array 11-i immediately before the blockage and the information indicating the cause of the blockage of the array 11-i. Current table 1
26b is an R indicating the current state of the disk array 11-i.
Used to store AID configuration information.

The RAID configuration information of the disk array 11-i includes: (1) RAID level, stripe size, and logical capacity applied to the disk array 11-i (the total disk capacity of the disk array 11-i provided to the user) RA including
ID basic information (2) Information on HDD (member HDD) 111 constituting disk array 11-i (including HDD number and number) (3) Operating status of disk array 11-i (normal or closed as a whole array) And each member HDD
It is composed of information indicating the operation state (normal / failure) of the 111.

The disk array controller 12 has a plurality of H
The disk area of the disk array 11-i (i = 1, 2) constituted by the DD (member HDD) 111 is divided into a plurality of stripes 201 as shown in FIG.

The stripe 201 is a basic unit that is striped with redundancy by the RAID method. The striping arrangement means that successive data is sequentially mapped to a continuous disk array 11-i. The redundancy refers to each HD included in the stripe 201.
This means that the exclusive OR value of the data of all the other HDDs 111 is stored as redundant data in one of the D111. Due to this redundancy, even if one of the HDDs 111 constituting the disk array 11-1 fails, the stripe 20
By performing an exclusive OR operation on the data of all the other HDDs 111 included in 1, the repaired data of the failed HDD 111 can be generated. In general, the size of the stripe 201 is set to about 64 Kbytes to 256 Kbytes per HDD 111.

The data in the stripe 201 is stored in the HDD 1
Access is made in units of the sector block 202, which is the eleventh minimum access unit. The size of the sector block 202 is generally 512 bytes.

Each HDD 111 has a sector block 20
When an error 2 (media error) occurs, that is, when a defective sector occurs, a plurality of dedicated sector blocks 203 used as replacements for the defective sector, so-called alternative blocks (alternate sector blocks) 203 are secured. .

Next, the disk array device 1 having the configuration shown in FIG.
0, (A) operation when receiving a data access request from the host computer 20, (B) operation when detecting a HDD failure, (C) operation when receiving a disk array recovery (recovery) request by a user operation. Will be sequentially described by way of example.

(A) Operation at the time of receiving a data access request First, the operation of the disk array device 10 when a data access request is issued from the host computer 20 to the disk array device 10 will be described with reference to the flowchart of FIG. I will explain.

From the host computer 20 to the interface 21
The data access request issued to the disk array device 10 via the interface is received by the interface controller 121 in the disk array controller 12 and the microprocessor 125 in the disk array controller 12
Passed to.

When the microprocessor 125 receives a data access request from the host computer 20, the disk array to be accessed (corresponding disk array)
It is determined whether 11-i (i is 1 or 2) is operating or closed (step S1). This judgment is
The corresponding disk array 11-i stored in the current table 126b secured on the flash memory 126
This is performed based on the RAID configuration information (information indicating the operating state of the disk array 11-i included in the RAID configuration information).

If the corresponding disk array 11-i is operating, the microprocessor 125 starts a data access process to the disk array 11-i (step S2). On the other hand, when the corresponding disk array 11-i is closed, the microprocessor 125 ends the error without accessing the disk array 11-i (step S3). The reason is as follows.

First, when multiple HDD failures occur in which a plurality of HDDs (member HDDs) 111 fail in the same disk array 11-i, data recovery using RAID redundancy becomes impossible. Disk array 1
1-i is closed. If the disk array 11-i in which multiple failures of the HDD have occurred remains unoccupied without being closed, access to the failed HDD will adversely affect access to other normal HDDs (the interface of the HDD may be affected). Lock, etc.). Therefore, the disk array 11-i in which multiple HDD failures have occurred
Is blocked, that is, even if another normal HDD exists, it is determined that the entire disk array 11-i has a failure and is not accessed thereafter.

(B) Operation when HDD Failure is Detected Next, the operation when the failure of the HDD 111 constituting the disk array 11-i is detected will be described with reference to the flowchart of FIG.

The microprocessor 125 operates in accordance with a control program stored in the flash memory 126.
Each HDD 111 in each disk array 11-i is periodically monitored. Here, the media inspection processing for detecting a partial failure (media error) of each HDD 111 by reading the storage contents of each HDD 111 is also performed for the HDDs 111 constituting the closed disk array 11-i.

When a new failure of the HDD 111 is detected in the above-described media inspection processing or the above-described data access processing, etc., the microprocessor 125 sets the detected HDD 111 to a corresponding disk array 11-i as a member HDD. It is determined whether or not is operating or closed (step S11).

If the corresponding disk array 11-i is operating, the microprocessor 125 determines whether or not the disk array 11-i is still operable even if a failure of the member HDD 111 is newly detected. A determination is made (step S12). Here, the corresponding disk array 11-i
When all the other HDDs 111 are normal, it is determined that the disk array 11-i is operable. On the other hand, at least one other in the corresponding disk array 11-i.
If one of the HDDs 111 has already failed, that is, if a new HDD 111 has failed and the failed HDD 111 data has an unrecoverable multiple failure state even with RAID redundancy, the disk array 11-i It is determined that the disk array 11-i cannot be operated and that the disk array 11-i needs to be closed.

When the microprocessor 125 determines that the corresponding disk array 11-i is inoperable, the microprocessor 125 can use the state of the disk array 11-i later when closing the disk array 11-i. As the information for returning to the state, the current, that is, the RAID configuration information immediately before the blockage and the blockage cause are stored in the recovery table 126a on the flash memory 126 (step S13).

Next, the microprocessor 125 performs a process of closing the corresponding disk array 11-i (step S).
14). At this time, the microprocessor 125, due to the failure of the plurality of HDDs 111 in the disk array 11-i,
HDD that failed even with RAID data redundancy
The fact that the data in the disk array 111 cannot be restored and the disk array 11-i is closed as a result is notified through the operation panel 128 or dedicated software on the host computer 20. And the microprocessor 12
5 is the current table 1 on the flash memory 126
The corresponding disk array 11-i currently stored in 26b
Is updated to new RAID configuration information reflecting the array blockage at step S14 (step S15), and then the process proceeds to step S16.

On the other hand, if it is determined in step S11 that the corresponding disk array 11-i is in a closed state, or if it is determined in step S12 that the disk array 11-i is operable, the microprocessor 125 is left as it is. Proceed to step S16.

The microprocessor 125 determines in step S1
6, the newly detected HDD 111
Is closed (disconnected from the disk array 11-i). Then, the microprocessor 125 updates the RAID configuration information of the corresponding disk array 11-i currently stored in the current table 126b to new RAID configuration information reflecting the blockage of the failed HDD 111 in Step S16 (Step S17). .

(C) Operation When Receiving Recovery Request of Disk Array Next, for the operation when a recovery (recovery) process for the blocked disk array 11-i is requested, refer to the flowchart of FIG. I will explain.

Even if the disk array is blocked due to multiple failures of the HDD, it is necessary for the user to urgently resume the operation of the array, or to read only important data from the array and make a backup. is there. In such a case, in this embodiment, the user can request the recovery of the desired disk array 11-i by operating the operation panel 128 provided in the disk array control device 12 of the disk array device 10. It has become. Further, in the present embodiment, the host computer 20 using the disk array device 10 also responds to the user's operation according to the dedicated software installed in the host computer 20 according to the user's operation.
Can request the disk array controller 12 of the disk array device 10 to recover the disk array 11-i.

The operation panel 128 is operated by the user.
Alternatively, the disk array recovery (recovery) request issued from the host computer 20 is accepted by the microprocessor 125 of the disk array controller 12. Upon receiving the recovery request, the microprocessor 125 determines whether the disk array (corresponding disk array) 11-i specified by the request is blocked based on the corresponding RAID configuration information on the current table 126b. (Step S21).

If the corresponding disk array 11-i is not blocked, the microprocessor 125 ends the recovery process for the recovery request.

On the other hand, if the corresponding disk array 11-i is blocked, the microprocessor 125 reads the corresponding disk array 11-i from the recovery table 126a.
The RAID configuration information and the cause of the blockage just before the blockage are read out (step S22). Then, the microprocessor 125 determines that the cause of the blockage is the corresponding disk array 11-i.
It is determined whether or not there is a media error (partial failure) of a sector block in the HDD 111 that failed immediately before the blockage of the HDD 111 (that is, the HDD 111 of the corresponding disk array 11-i that triggered the blockage). A determination is made (step S23).

If the blockage of the corresponding disk array 11-i is caused by a media error of a sector block, the microprocessor 125 performs a data read test of the sector block (step S24).
Then, the microprocessor 125 determines whether or not reading is still impossible by the reading test.
That is, it is determined whether or not the media error is reproduced (step S25).

If the media error of the sector block that caused the blockage of the disk array 11-i has been reproduced, the microprocessor 125 discards the data of the sector block in which the media error has been reproduced and substitutes the sector block. Substitution processing for substituting blocks is performed (step S26). By this alternative processing, access to the sector block in which the media error has been reproduced is correctly performed. However, the previous data has been lost. Then, the microprocessor 125 notifies the user that partial data loss has occurred due to a media error in the sector block (step S27). For this notification, a method of notifying through the operation panel 128 or a method of notifying through the dedicated software on the host computer 20 is applicable.

The microprocessor 125 proceeds to step S2
7 is executed, the RAID configuration information immediately before blockage read out from the recovery table 126a in step S22 is overwritten on the current table 126b (step S22).
28), and thereafter operate according to the RAID configuration information.

On the other hand, if it is determined in step S23 that the cause of blockage of the corresponding disk array 11-i is other than a media error, or if it is determined in step S25 that the media error is not reproduced, the microprocessor 125 Directly proceeds to step S28, and overwrites the RAID configuration information immediately before blockage read out in step S22 on the current table 126b.

As described above, the disk array 11-i that has been closed once is restored to the state in which it could be used immediately before the closing. As a result, the disk array 11-i can be used again, so that it is possible to urgently continue operation and backup important data in the disk array 11-i. . However, such a state can be truly recovered only when the failure of the HDD 111 that caused the blockage is temporary or a partial failure such as a media error. Permanent H
In the case of a DD111 failure, even if the corresponding disk array 11-i is returned to the state immediately before the closure using the RAID configuration information immediately before the closure, the failure of the HDD 111 that caused the failure is not removed. Is detected. In this case, the corresponding disk array 11-i is immediately closed again by the processing according to the flowchart of FIG.

In the embodiment described above, the recovery table 126a and the current table 126b are stored in the flash memory 12 mounted on the disk array controller 12.
6 (rewritable non-volatile memory), but it is not limited to this. For example, the disk array device 1 includes a partial area in the HDD 111 that includes a recovery table 126a and a current table 126b separately from the area for storing user data.
0 may be allocated as a storage area for its own management information.

The present invention is not limited to the above embodiment, and can be variously modified at the stage of implementation without departing from the scope of the invention. Further, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some components are deleted from all the components shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effects described in the column of the effect of the invention can be solved. If you get
A configuration from which this configuration requirement is deleted can be extracted as an invention.

[0056]

As described above in detail, according to the present invention, even if a disk array whose member is the disk drive becomes blocked due to multiple failures of the disk drive and becomes inaccessible, the disk array can be accessed. When the disk array is closed, the RAID configuration information of the disk array immediately before the blockage is stored as the recovery RAID configuration information in the nonvolatile recovery storage area, and thereafter, the recovery (recovery) of the blocked disk array is performed. Is requested according to a user operation, the disk array can be easily restored to a state immediately before the blockage based on the recovery RAID configuration information stored in the recovery storage area. Thus, if the failure of the disk drive that caused the blockage of the disk array is a transient one or a partial one such as a media error, the disk array after the recovery is accessed and the Operation can be continued, backup of important data in the array concerned can be taken, and user data can be protected and damage to the system can be minimized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a disk array device according to an embodiment of the present invention.

FIG. 2 shows a disk array 11-i (i = 1, 2) in FIG.
Stripes used to manage the disk space of the
FIG. 4 is a diagram for explaining a relationship between a sector block which is the minimum unit of the HDD 111 and a substitute block used as a substitute for the defective sector when the sector block becomes a defective sector.

FIG. 3 is a flowchart illustrating a processing procedure when a data access request is received.

FIG. 4 is a flowchart for explaining a processing procedure when an HDD failure is detected.

FIG. 5 is a flowchart illustrating a processing procedure when a recovery request is received.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Disk array apparatus 11-1, 11-2, 11-i ... Disk array 12 ... Disk array controller 111 ... HDD (disk drive) 125 ... Microprocessor 126 ... Flash memory 126a ... Recovery table (2nd storage area) ) 126b: current table (first storage area) 128: operation panel

Claims (7)

[Claims] 1. RAID (Redundant Arrays of Inexpensive Disks) comprising a plurality of disk drives
A non-volatile first storage area that includes at least one disk array of a configuration and stores first RAID configuration information indicating at least the current configuration and operating status of the disk array; and the disk array is closed. A disk array error recovery method in a disk array device in which a second storage area for storing at least a second RAID configuration information indicating a configuration and an operation state of the disk array immediately before the blockage is secured. When at least two of the plurality of disk drives constituting the disk array have failed, closing the disk array; and closing the disk array when closing the disk array. First RAI immediately before the disk array is closed stored in the Saving the configuration information as the second RAID configuration information in the second storage area; and, after closing the disk array, storing the first RAID configuration information in the first storage area of the disk array. Updating the disk array to reflect the post-blocking state of the disk array; and when a recovery request to recover the blocked disk array to a usable state is given to the disk array device in accordance with a user operation Reading the second RAID configuration information immediately before the disk array specified by the recovery request is closed from the second storage area; and reading the second RAID configuration information read from the second storage area. RAI
D forcibly returning the disk array to the state immediately before the blockage based on the D configuration information, and overwriting the first storage area with the second RAID configuration information as the first RAID configuration information. An error recovery method for a disk array. 2. When closing the disk array,
When the information indicating the cause of the blockage of the disk array is also stored in the second storage area together with the second RAID configuration information, and when the disk array is forcibly returned to the state immediately before the blockage according to the recovery request, From the second storage area, the second RAI immediately before the disk array is closed
Reading the information indicating the cause of the blockage of the disk array in addition to the D configuration information; and if the read out cause of blockage indicates a media error that is a partial failure of the disk drive, And replacing the generated block with a replacement sector block. After the replacement processing, the second RAID configuration information of the disk array immediately before the blockage is replaced with the first RAID configuration information. 2. The error recovery method for a disk array according to claim 1, wherein the first storage area is overwritten. 3. A RAID (Redundant Arrays of Inexpensive Disks) comprising a plurality of disk drives.
A disk array control apparatus for controlling at least one disk array having a configuration, wherein: a first storage area for storing first RAID configuration information indicating at least the current configuration and operating status of the disk array; A non-volatile storage unit that secures at least a second storage area for storing at least a second RAID configuration information indicating a configuration and an operation state of the disk array immediately before the blockage; Means for closing the disk array when at least two of the plurality of disk drives constituting the disk drive have failed; and when the disk array is closed by the closing means, the first storage area The first RAID configuration information stored immediately before the disk array is closed is stored in the 2
After the disk array is closed, the first RAID configuration information on the first storage area of the disk array is stored as the RAID configuration information of the disk array after the disk array is closed. A RAID configuration information update unit for updating to reflect the status, and a recovery request for recovering the disk array in a blocked state to a usable state is given to the disk array device according to a user operation. Means for reading, from the second storage area, the second RAID configuration information immediately before the disk array designated by the recovery request is closed, and the second RAI read from the second storage area
Recovery means for forcibly returning the disk array to the state immediately before the blockage based on the D configuration information and overwriting the second RAID configuration information in the first storage area as the first RAID configuration information. A disk array control device, characterized in that: 4. RAID (Redundant Arrays of Inexpensive Disks) comprising a plurality of disk drives
A first storage area for storing at least one first RAID configuration information indicating at least the current configuration and operating state of the disk array; and A disk array that controls a disk array including a plurality of disk drives in which a second storage area for storing at least the second RAID configuration information indicating at least the configuration and the operating state of the disk array immediately before the blockage is secured A control unit, wherein at least two of the plurality of disk drives constituting the disk array have failed, a means for closing the disk array; and the closing means closes the disk array. At this time, the disk array stored in the first storage area is Wherein the first RAID configuration information before 塞直 second
After the disk array is closed, the first RAID configuration information on the first storage area of the disk array is stored as the RAID configuration information of the disk array after the disk array is closed. A RAID configuration information update unit for updating to reflect the status, and a recovery request for recovering the disk array in a blocked state to a usable state is given to the disk array device according to a user operation. Means for reading, from the second storage area, the second RAID configuration information immediately before the disk array designated by the recovery request is closed, and the second RAI read from the second storage area
Restoring means for forcibly returning the disk array to the state immediately before the blockage based on the D configuration information and overwriting the second RAID configuration information in the first storage area as the first RAID configuration information. A disk array control device, characterized in that: 5. The blocking-time RAID configuration information updating means, when the disk array is blocked by the blocking means, stores information indicating a cause of the blockage of the disk array together with the second RAID configuration information. And the blocking cause information read from the second storage area by the reading means when the recovery request is given is a partial failure of the disk drive. 5. The disk according to claim 3, further comprising: a sector block replacement unit for performing processing for replacing a block in which the media error has occurred with a replacement sector block when a media error is indicated. Array controller. 6. RAID (Redundant Arrays of Inexpensive Disks) comprising a plurality of disk drives
In a disk array device including at least one disk array having a configuration and a disk array control device that controls the disk array, first RAID configuration information indicating at least the current configuration and operating status of the disk array is stored. And a second storage area for storing, when the disk array is closed, second RAID configuration information indicating at least the configuration and operating status of the disk array immediately before the blockage. And at least two disk drives of the plurality of disk drives constituting the disk array fail when the disk array controller has a failure. When the disk array is closed by the closing means, The first RAID configuration information stored in the first storage area immediately before the disk array is closed is stored in the second storage area.
After the disk array is closed, the first RAID configuration information on the first storage area of the disk array is stored as the RAID configuration information of the disk array after the disk array is closed. A RAID configuration information updating unit at the time of shutdown for updating to reflect the status, and when a recovery request for recovering the disk array in the shutdown status to a usable status is given to the disk array device according to a user operation. Means for reading, from the second storage area, the second RAID configuration information immediately before the disk array specified by the recovery request is closed, and the second RAI read from the second storage area
Restoring means for forcibly returning the disk array to the state immediately before the blockage based on the D configuration information and overwriting the second RAID configuration information as the first RAID configuration information in the first storage area. A disk array device characterized by the above-mentioned. 7. The blocking-time RAID configuration information updating means, when the disk array is blocked by the blocking means, stores information indicating a cause of the blockage of the disk array together with the second RAID configuration information. The disk array control device is configured to store the block cause information read from the second storage area by the reading unit when the recovery request is given. The apparatus according to claim 1, further comprising: a sector block replacement unit for performing processing for replacing a block in which the media error has occurred with a replacement sector block when a media error that is a partial failure of the medium is indicated. 7. The disk array device according to 6.