JPH07160434A - Array type storage device system - Google Patents

Abstract

PURPOSE:To not alter redundant data and eliminate the need to regenerate the redundant data by storing a storage means with new logical constitution of plural storage devices including extended storage devices after previously initializing all the extended storage devices to 0 or 1. CONSTITUTION:A data block 41-4 of a magnetic disk device 4-4 is a parity block, which stores parity data of data blocks 41-1 to 41-3 before extension and parity data of the data blocks 41-1 to 41-3 and 41-5 after extension. Even parity 01101001 is stored as the head bytes of the data blocks 41-1 to 41-3. When a magnetic disk device 4-5 is extended, the magnetic disk device 4-5 is initialized to 0, so the contents of the data block 41-5 are all 0. Parity of none of the data blocks 41-1 to 41-3 and 41-5 changes and the data block 41-4 as the parity data block need not be updated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an array type storage device system in which a plurality of storage devices are arranged in an array and redundant data is stored together with normal input / output data. The present invention relates to an array-type storage device system capable of adding storage devices without performing the above.

[0002]

2. Description of the Related Art Conventionally, a disk array system has been known as an array type storage device system.

The disk array system is a system for realizing a high data transfer speed between a processing device and an external storage device by operating a large number of magnetic disk devices in parallel in a computer system.

As an example of the configuration of the disk array system, a paper by Paterson et al. (D. Paterson, G. Gi
bson, R. Katz, "A Case for Redundant Arrays of Inex
pensive Disks (RAID) ", ACM SIGMOD conference procee
dings, 1988, pp.109-116).

In the above paper, RAID (Redundunt Arra
It presents a form of disk array called y of Inexpensive Disks).

In RAID levels 1 to 5, redundant data is stored in the magnetic disk drive together with normal input / output data.

By storing redundant data, it becomes possible to recover the missing input / output data by using the data recovery function when the input / output data is missing.

In the RAID levels 1 to 5, it is relatively easy to add a magnetic disk device for each redundant data creation unit.

In such an expansion, the expanded area can be regarded as a continuous area and added immediately after the area before the expansion, or the expanded area can be incorporated logically as another magnetic disk device. It is possible.

However, in the above paper, the disk array
No mention is made of adding a magnetic disk device to the system in units of one unit, in particular, a means of adding a magnetic disk device without stopping the system.

A method of adding a magnetic disk device in a conventional disk array system will be described with reference to FIGS. 13 and 14.

FIG. 13 is a diagram showing a data layout before the addition of a magnetic disk device in a conventional disk array system of RAID level 5.

In FIG. 13, a magnetic disk device 4-1 is used.
To 4-4 form a logical disk (logical disk), and the data of the logical disk is distributed and stored in the disk devices 4-1 to 4-4 for each block.

In FIG. 12, D0 to D17 indicate blocks of continuous data in the logical disk.

Further, the magnetic disk array devices 4-1 to 4-4
-4, there is a block in which parity data is stored for each row consisting of blocks having the same address.

In creating parity data, that is, redundant data, redundant data is created by using an exclusive OR for each bit of data from a plurality of magnetic disk devices, which is a unit for creating redundant data.

For example, the parity data block P0 in the first row stores the result of the exclusive disjunction for each bit of the data block D0, the data block D1, and the data block D2.

Here, it is assumed that the magnetic disk device 4-5 is additionally installed.

FIG. 14 is a diagram showing the data arrangement after the magnetic disk device is added to the conventional disk array system.

The data is distributed and stored in the five magnetic disk array devices 4-1 to 4-5, and the parity is recalculated.

For example, in the parity data block P0 'of the first row, the data block D0 and the data block D1 are included.
The result of the bitwise alternative OR of the data block D2 and the data block D3 is stored.

As described above, when an attempt is made to add a magnetic disk device for each unit at RAID level 5, it is necessary to refill data and regenerate redundant data.

[0023]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
As described by taking the system as an example, in the conventional storage device system of the array type, when the storage device is added, it is necessary to add the storage device group for distributing the data as a unit.

Therefore, there is a problem that the unit of expansion becomes large and the cost for expanding the storage capacity increases.

Further, if an attempt is made to add a storage device for each unit, there is a problem in that the data must be refilled and the redundant data must be recreated.

The present invention has been made to solve the above-mentioned problems of the prior art. An object of the present invention is to refill data in an array type storage device system without stopping the system. Another object of the present invention is to provide a technology capable of adding a storage device for each unit without regenerating redundant data or redundant data.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0028]

In order to achieve the above object, the means (1) of the present invention distributes a plurality of storage devices and redundant data and transfer data from a processing device to the plurality of storage devices. And a means for storing required data in response to a data read request from the processing device, and a means for transferring the necessary data from one or more storage devices to the read processing device. Is
In an array type storage device system comprising a control device having means for restoring inaccessible data using redundant data, the control device stores storage means for storing the logical configuration of the plurality of storage devices before expansion, When a new storage device is added under the control device, a means for writing all 0 data to the added storage device, and a means for writing all 0 data to the added storage device, and after the addition Means for storing new logical configurations of a plurality of storage devices including the added storage device in the storage means.

The means (2) of the present invention comprises a plurality of storage devices, a means for distributing and storing redundant data and transfer data from the processing device to the plurality of storage devices, and data reading from the processing device. A means for transferring necessary data from one or more storage devices to the read processing device in response to the request;
In a case where the data on the storage device cannot be directly accessed due to a failure or the like, in a storage device system of an array type including a control device having means for restoring inaccessible data using redundant data, the control device is Storage means for storing the logical configuration of the plurality of storage devices, and means for writing all 1 data to the added storage device when the storage device is newly added under the control device; After writing all 1 data to the storage device, the storage device further comprises a means for storing a new logical configuration of a plurality of storage devices including the added storage device in the storage means.

Further, the means (3) of the present invention comprises a plurality of storage devices, a means for distributing and storing redundant data and transfer data from the processing device to the plurality of storage devices, and data reading from the processing device. A means for transferring necessary data from one or more storage devices to the read processing device in response to the request;
In a case where the data on the storage device cannot be directly accessed due to a failure or the like, in a storage device system of an array type including a control device having means for restoring inaccessible data using redundant data, the control device is When a storage device for storing the logical configuration of the plurality of storage devices and a new storage device is added under the control of the control device, it is confirmed that all zero data is written in the added storage device. And a new logical configuration of a plurality of storage devices including the added storage device after the addition is confirmed in the storage device after confirming that all data of 0 is written in the added storage device. And means for storing.

Further, the means (4) of the present invention comprises a plurality of storage devices, a means for distributing and storing redundant data and transfer data from the processing device to the plurality of storage devices, and data reading from the processing device. A means for transferring necessary data from one or more storage devices to the read processing device in response to the request;
In a case where the data on the storage device cannot be directly accessed due to a failure or the like, in a storage device system of an array type including a control device having means for restoring inaccessible data using redundant data, the control device is When a storage device for storing the logical configuration of the plurality of storage devices and a new storage device is added under the control of the control device, it is confirmed that all 1 data is written in the added storage device. And a new logical configuration of a plurality of storage devices including the added storage device after the addition is confirmed in the storage device. And means for storing.

Further, the means (5) of the present invention is added to the means (1) to (4), when the control device has a new storage device under the control device. It is characterized in that the storage device has means for storing a part or all of the redundant data.

[0033]

According to the above means, in the array type storage device system, when the storage devices are added, all the added storage devices are initialized to 0 or 1 in advance, and then the added storage devices are added. By storing the new logical configuration of the plurality of storage devices including the storage device in the storage means, the newly added storage device is logically incorporated into the storage device system of the array type, so that the redundant data does not change. Therefore, it is not necessary to regenerate redundant data.

Since the added storage device itself constitutes a logical disk, it is not necessary to refill data.

Further, it is possible to initialize the storage device to be added independently of the input / output operation with the processing device.
Further, since it is possible to incorporate a storage device to be added by simply changing the logical configuration of a plurality of storage devices without refilling data or regenerating redundant data, it is not necessary to stop the system at the time of addition.

Further, according to the above means, when the redundant data is updated, the storage device for storing the redundant data is moved to the added storage device, so that the load balance can be achieved. This makes it possible to improve the performance.

[0037]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In all the drawings for explaining the embodiments, parts having the same function are designated by the same reference numerals, and the repeated description thereof will be omitted.

[0039]

First Embodiment FIG. 1 is a block diagram showing a schematic configuration of an array type storage device system according to a first embodiment of the present invention.

In FIG. 1, 1 is a processing device, 2 is a disk array control device which is a control device, 20 is a CPU, and 21.
Is a host interface, 4-1 to 4-5 are magnetic disk devices as storage devices, 23-1 to 23-5 are disk interfaces, 22 is a buffer, 24 is control storage, 24
Reference numeral 1 is a configuration management table.

The disk array control device 2 is connected to the processing device 1 via the host interface 21, and is also connected to the magnetic disk devices 4-1 to 4-5 via the disk interfaces 23-1 to 23-5. To be done.

The buffer 22 is used as a data buffer or cache between the processing device 1 and the magnetic disk devices 4-1 to 4-5, and as a temporary storage device for generating parity data.

The control storage 24 is a storage device for storing various control tables and codes necessary for controlling a plurality of magnetic disk devices such as a configuration management table 241 for managing the logical configuration of the disk array.

FIG. 2 is a diagram showing the configuration management table 241 in the first embodiment.

As shown in FIG. 2, the configuration management table 24
1 describes, for each logical disk device, the number of the corresponding magnetic disk device, the number of data blocks, the block number for storing parity data that is redundant data, and the like.

The disk array controller 2 is the processor 1
The input / output request from the processing unit 1 is analyzed and the input / output request is issued to the magnetic disk devices 4-1 to 4-5 as necessary.
And the disk array control device 2 and between the disk array control device 2 and the magnetic disk devices 4-1 to 4-5.

When any of the magnetic disk devices 4-1 to 4-5 fails, the data and parity data are read from the magnetic disk devices other than the failed magnetic disk device in response to the input request from the processing device 1. Control such as data recovery for recovering the contents of the failed magnetic disk device and transferring them to the processing device, and data reconstruction for recovering the contents of the failed magnetic disk device and writing them to the alternate magnetic disk device.

FIG. 3 is a diagram showing the data arrangement in the magnetic disk in the first embodiment.

In the first embodiment, the magnetic disk device for storing the parity data is fixed and the magnetic disk device is added.

In FIG. 3, before expansion, the data of the logical disks 0 to 2 are stored in the magnetic disk devices 4-1 to 4-3, respectively, and the parity data is stored in the magnetic disk device 4-4.

Here, consider a case where the magnetic disk device 4-5 is added as the logical disk 3.

In this case, all the magnetic disk devices 4-5 are initialized to 0 in advance.

The initialization may be performed by an external device or the disk array controller 2.

When the initialization is performed by an external device, the entire surface of the magnetic disk device 4-5 is read in order to confirm whether or not the initialization is correctly performed.

When it is confirmed that the magnetic disk device 4-5 is connected and initialized normally, the configuration management table 241 for managing the logical configurations of the plurality of magnetic disk devices is changed to change the magnetic disk device 4-5. Is incorporated into the storage device system as the logical disk 3.

Next, the contents of the data block / parity data block when the magnetic disk device is added will be described. Here, an example using even parity is shown, but the same applies to odd parity.

The magnetic disk device 4 according to the first embodiment.
Parity change when -5 is added will be described with reference to FIGS.

FIG. 4 is a diagram showing the parity when the magnetic disk 4-5 is added in the first embodiment.

In FIG. 4, the data block 41-4 of the magnetic disk device 4-4 is a parity data block, and the data blocks 41-1 to 41-3 of the magnetic disk devices 4-1 to 4-3 before the expansion are added. And the parity data of the data blocks 41-1 to 3-4 of the magnetic disk devices 4-1 to 4-3 and the data block 41-5 of the magnetic disk device 4-5 are stored.

As shown in FIG. 4, the data block 41-
The values of the first bytes of 1 to 41-3 are 00001111, 00, respectively.
Since these are 110011 and 01010101, 01101001, which is the even parity value, is stored in the first byte of the parity data block 41-4 before the addition.

If the magnetic disk unit 4-5 is added, the magnetic disk unit 4-5 is initialized to 0, so that the contents of the data block 41-5 are all 0.

Therefore, the data blocks 41-1 to 41-
The parity of 3 and 41-5 does not change, and it is not necessary to update the data block 41-4 which is a parity data block.

Next, a change in parity when writing to the data block 41-5 occurs after adding the magnetic disk device 4-5 will be examined.

FIG. 5 is a diagram showing a change in parity at the time of writing to the additional magnetic disk device 4-5 in the first embodiment.

As shown in FIG. 5, the magnetic disk device 4-
By writing 5 to the data lock 41-5, the first byte of the data block 41-5 changes from 00000000 to 010101.
Suppose it changed to 01.

Since the data block 41-4 is the parity data block of the data blocks 41-1 to 41-3 and 41-5, the even bytes of these even parity values 001111100 are included in the first byte of the data block 41-4. Remembered.

A new parity value is similarly calculated and stored in the subsequent bytes of the data block 41-4.

The updated parity is the data block 41.
-1 to 41-3 and 41-5 may be calculated, or the exclusive OR of the pre-update data and the pre-update parity data of the data block 41-5 and the post-update data of the data block 41-5 may be calculated. You may calculate it.

When the updated parity is calculated by the latter method, the data blocks 41-5 and 4 in FIG.
1-4 is the pre-update data 00000000, pre-update parity data 01101001, and the data block 41-5 in FIG. 5 is the post-update data 01010101, which are the exclusive OR of these 00
111100 is stored in the first byte of the parity data block 41-4.

As described above, any method may be used for calculating the parity.

It is also possible to initialize the additional magnetic disk unit 4-5 to 1.

However, in that case, the magnetic disk drive 4-5
It is necessary to change the parity to be used before and after the addition of from the even parity to the odd parity.

That is, if the magnetic disk device 4-5 is initialized to 1, the first byte of the data block 41-5 becomes 11111111.

In this case, as shown in FIG. 4, the value of the first byte of each of the data blocks 41-1 to 41-3 is 00.
001111, 00110011, 01010101, and the even-numbered parity value 01101001 is stored in the first byte of the parity data block 41-4 before expansion.

Therefore, if the odd parity is used after adding the magnetic disk device 4-5 initialized to 1, the parity of the data blocks 41-1 to 41-3 and 41-5 does not change, and the parity data block is used. It is not necessary to update a data block 41-4.

[0076]

Second Embodiment FIG. 6 is a diagram showing a data arrangement in a magnetic disk according to the second embodiment.

In the second embodiment, the parity data is distributed and stored / disposed in the magnetic disk devices 4-1 to 4-4 to add the magnetic disk devices.

The system configuration of the second embodiment is the same as that of the first embodiment.

In FIG. 6, magnetic disk devices 4-1 to 4-1 are used.
The data 4-4 stores the data of the logical disks 0 to 3 and the parity data, respectively.

Here, consider a case where the magnetic disk device 4-5 is added as the logical disk 4.

As in the case of FIG. 3, the procedure of expansion is such that the magnetic disk devices 4-5 are all initialized to 0 in advance, the configuration management table 241 is changed, and the magnetic disk devices 4-5 are replaced by the logical disks 4. As a disk array.

For example, in the data block 42-3 of the magnetic disk unit 4-3, the magnetic disk unit 4--3 is added before the expansion.
1, 4-2, 4-4 data blocks 42-1 and 42-
2, 42-4 parity data, the parity of the data blocks 42-1, 42-2, 42-4, 42-5 of the magnetic disk devices 4-1, 4-2, 4-4, 4-5 after expansion The data is stored.

However, since the magnetic disk device 4-5 is initialized to 0, the contents of the data block 42-5 are all 0, and the contents of the data block 42-3 in which parity data is stored do not change.

After the addition, the magnetic disk device 4-1
Data blocks 42-1 and 4-2 of 4-2, 4-4, and 4-5
When any of 2-2, 42-4, and 42-5 is updated, those parity data are calculated and stored in the data block 42-3.

Also in the second embodiment, it is possible to initialize the additional magnetic disk device 4-5 to 1 as in the first embodiment.

In this case, for the reasons described above, it is necessary to change the parity used before and after adding the magnetic disk device 4-5 from even parity to odd parity.

[0087]

[Third Embodiment] Next, a description will be given of an embodiment in which parity data is distributed and arranged also on an additional magnetic disk.

FIG. 7 is a diagram showing the data arrangement in the magnetic disk in the third embodiment.

In the third embodiment, the magnetic disk device 4-5 is used.
Parity data before expansion of the magnetic disk unit 4-1
4-4 are distributed and stored in the magnetic disk device 4
After the addition of -5, the parity data is distributed and stored and arranged in the magnetic disk devices 4-1 to 4-5.

The system configuration of the third embodiment is the same as that of the first embodiment.

The magnetic disk devices 4-1 to 4-4 store the data and parity data of the logical disks 0 to 3, respectively, and the added magnetic disk device 4-5 stores the data and parity data of the logical disk 4. Remembered.

Since all of the magnetic disk devices 4-5 have been initialized to 0 in advance, when the data block of the magnetic disk device 4-5 is used as the data of the logical disk 4, the parity data does not change during the expansion.

When the parity data is transferred to the magnetic disk device 4-5 by the expansion, the parity data block originally assigned to another magnetic disk device becomes an unused block and cannot be updated. However, it is included in the calculation of parity data.

For example, before adding the magnetic disk device 4-5, the data block 43-1 of the magnetic disk device 4-1 is added.
Is the parity data of the data blocks 43-2 to 43-4 of the magnetic disk devices 4-2 to 4-4, and after the addition of the magnetic disk device 4-5, the data block 43- of the magnetic disk device 4-5. 5 is a data block 43-2 to 4
It becomes a parity data block of 3-4, and the data block 43-1 becomes an unused block.

Data block 4 which has become an unused block
By including 3-1 in the parity data calculation, the initial value of the data block 43-5 that is the parity data block can be set to 0.

As a result, it becomes unnecessary to regenerate the parity data blocks assigned to the data blocks of the magnetic disk device 4-5.

The magnetic disk device 4 according to the third embodiment.
Parity change when -5 is added will be described with reference to FIGS. 8 and 9.

FIG. 8 is a diagram showing parity when the magnetic disk 4-5 is added in the third embodiment.

In FIG. 8, before addition, the even parity values of the data blocks 43-2 to 43-4 of the magnetic disk devices 4-2 to 4-4 are stored in the data block 43-1 of the magnetic disk device 4-1. Has been done.

Therefore, the data blocks 43-2 to 43-
The first 4 bytes are 00011111, 00110011, and 010101, respectively.
When 01, the value of the first byte of data block 43-1 is
It is 01100001.

Here, consider a case where the data block 43-5 of the magnetic disk device 4-5 is used as a parity data block.

If the data block 43-5 is the even parity of the data blocks 43-2 to 43-4, 01101001 must be stored in the first byte of the data block 43-5.

However, if the data block 43-1 which has become an unused block is included in the parity data calculation and the parity data of the data blocks 43-1 to 43-4 are calculated, the parity data value becomes 0, and the data block The initial value of 43-5 can be set to 0.

As a result, even if the parity data is distributed and stored and arranged in the magnetic disk units to be added, the whole can be initialized to 0.

FIG. 9 is a diagram showing a parity change at the time of writing to the magnetic disk device in the third embodiment.

In FIG. 9, it is assumed that the first byte of the data block 43-2 is changed from 00011111 to 01010101.

Since the parity data block after the expansion is the data block 43-5, the data block 43-3 including the unused data block 43-1 is included.
The parity data of -1 to 43-4 are calculated, and the value of the first byte of the data block 43-5 is as shown in FIG.
It will be 01011010.

Like the data block 43-1 in FIG. 7, an area where the parity data is no longer required to be stored because the parity data is moved to the added magnetic disk unit 4-5 is set as an unused block. You can also use it by allocating another logical disk.

Also in the second embodiment, it is possible to initialize the additional magnetic disk device 4-5 to 1 as in the first embodiment.

In this case, for the reasons described above, it is necessary to change the parity used before and after adding the magnetic disk drive 4-5 from even parity to odd parity.

In each of the above embodiments, the physical magnetic disk device and the logical disk have a one-to-one correspondence, but the added magnetic disk device constitutes a different logical disk from that before the addition. Alternatively, if it is configured as an extension area of a logical disk before expansion, it is not always necessary that the physical magnetic disk device and the logical disk have a one-to-one correspondence.

For example, as shown in FIG. 10, one logical disk is constructed from the magnetic disk devices 4-1 to 4-3, and another logical disk is constructed from the added magnetic disk device 4-5. It is also possible.

Further, as shown in FIG. 11, the magnetic disk devices 4-1 to 4-3 are divided to form a plurality of logical disks, and the added magnetic disk device 4-5 is replaced with another logical disk. Can also be configured.

Further, when a plurality of magnetic disk devices are added at the same time, it is possible to construct one logical disk from a plurality of disk devices that are added at the same time.

In FIG. 12, one logical disk is constructed from the added magnetic disk devices 4-5 to 4-6.

Of course, it is also possible to divide the additional magnetic disk device to form a plurality of logical disks.

Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the scope of the invention.

[0118]

As described above, according to the present invention,
In an array-type storage device system, when adding storage devices, all storage devices to be added are set to 0 in advance.
Alternatively, after being initialized to 1, by storing the new logical configuration of a plurality of storage devices including the added storage device in the storage means, the newly added storage device is logically converted into an array type storage device system. Since it has been incorporated, the redundant data does not change, and therefore it is not necessary to regenerate the redundant data.

Since the added storage device itself constitutes a logical disk, it is not necessary to refill data.

Furthermore, it is possible to initialize the storage device to be added independently of the input / output operation with the processing device.
Further, since it is possible to incorporate a storage device to be added by simply changing the logical configuration of a plurality of storage devices without refilling data or regenerating redundant data, it is not necessary to stop the system at the time of addition.

As a result, the data availability associated with the expansion can be improved, and since the required capacity can be expanded by each capacity, the cost associated with the expansion of the storage capacity can be reduced.

Further, according to the above means, when the redundant data is updated, the storage device for storing the redundant data is moved to the added storage device, so that the load balance can be achieved. This makes it possible to improve the performance.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an array-type storage device system that is Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a configuration management table in the first embodiment.

FIG. 3 is a diagram showing a data arrangement in a magnetic disk according to the first embodiment.

FIG. 4 is a diagram showing parity when a magnetic disk is added in the first embodiment.

FIG. 5 is a diagram showing a change in parity at the time of writing to the additional magnetic disk device according to the first embodiment.

FIG. 6 is a diagram showing a data arrangement in a magnetic disk according to the second embodiment.

FIG. 7 is a diagram showing a data arrangement in a magnetic disk according to the third embodiment.

FIG. 8 is a diagram showing parity when a magnetic disk is added in the third embodiment.

FIG. 9 is a diagram showing a parity change at the time of writing to the magnetic disk device according to the third embodiment.

FIG. 10 is a diagram showing an example of configuring a logical disk from a plurality of magnetic disk devices in the present invention.

FIG. 11 is a diagram showing an example in which a plurality of magnetic disk devices are divided to form a plurality of logical disks in the present invention.

FIG. 12 is a diagram showing an example of configuring a logical disk from a plurality of additional magnetic disk devices in the present invention.

FIG. 13 is a diagram showing a data arrangement before adding a magnetic disk device in a conventional disk array system.

FIG. 14 is a diagram showing a data arrangement after adding a magnetic disk device in a conventional disk array system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Processing device, 2 ... Disk array control device, 21 ... Host interface, 22 ... Buffer memory, 23-1
23-5 ... Disk interface, 24 ... Control storage, 241 ... Configuration management table, 4-1 to 4-6 ... Magnetic disk device, 41-1 to 41-5 ... Data block,
43-1 to 43-5 ... Data blocks.

Front page continuation (72) Inventor Akira Yamamoto 1099 Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Ltd. Hitachi, Ltd. System Development Laboratory

Claims (5)

[Claims] 1. A plurality of storage devices, means for storing redundant data and transfer data from the processing device by distributing the data to the plurality of storage devices, and data required for a data read request from the processing device. It is composed of a controller having means for transferring data from one or more storage devices to the read processing device and means for restoring inaccessible data using redundant data when data on the storage device cannot be directly accessed due to a failure or the like. In the array-type storage device system, if the control device stores a logical configuration of the plurality of storage devices before the expansion and a new storage device is added under the control device, the expansion is performed. A means for writing all 0s data to the storage device, and a means for writing the all 0s data to the added storage device, and then adding the added storage device after the addition. An array type storage device system having means for storing a new logical configuration of a plurality of storage devices including the storage means in the storage means. 2. A plurality of storage devices, a means for distributing and storing redundant data and transfer data from the processing device to the plurality of storage devices, and a necessary data for a data read request from the processing device. It is composed of a controller having means for transferring data from more than one storage device to the read processing device and means for restoring inaccessible data using redundant data when data on the storage device cannot be directly accessed due to a failure or the like. In an array-type storage device system, if the control device stores a logical configuration of the plurality of storage devices before the expansion and a new storage device is added under the control device, the expansion is performed. A means for writing all 1's data to the storage device, and an additional storage device after the all 1's data is written to the additional storage device Storage system array format, characterized in that it comprises a means for storing a new logical configuration of a plurality of storage devices in the storage means, including. 3. A plurality of storage devices, a means for distributing and storing redundant data and transfer data from the processing device to the plurality of storage devices, and 1 data necessary for a data read request from the processing device. It is composed of a controller having means for transferring data from one or more storage devices to the read processing device and means for restoring inaccessible data using redundant data when data on the storage device cannot be directly accessed due to a failure or the like. In an array-type storage device system, if the control device stores a logical configuration of the plurality of storage devices before the expansion and a new storage device is added under the control device, the expansion is performed. A means for confirming that the data of all 0's are written in the storage device,
A means for storing new logical configurations of a plurality of storage devices including the added storage device after the addition in the storage means after confirming that all 0 data is written in the added storage device; An array-type storage device system comprising: 4. A plurality of storage devices, a means for storing redundant data and transfer data from the processing device by distributing the data to the plurality of storage devices, and a necessary data for a data read request from the processing device. It is composed of a controller having means for transferring data from one or more storage devices to the read processing device and means for restoring inaccessible data using redundant data when data on the storage device cannot be directly accessed due to a failure or the like. In an array-type storage device system, if the control device stores a logical configuration of the plurality of storage devices before the expansion and a new storage device is added under the control device, the expansion is performed. A means to confirm that the data of all 1s is written in the storage device,
A means for storing new logical configurations of a plurality of storage devices including the added storage device after the addition in the storage means after confirming that all one data is written in the added storage device; An array-type storage device system comprising: 5. The array-type storage device system according to any one of claims 1 to 4, wherein when a control device newly adds a storage device under the control device, the expansion is performed. Array type storage device system having means for storing a part or all of redundant data in the stored storage device.