JP5382466B2 - Storage device and storage device data write control method - Google Patents

Description

  The present invention relates to a storage apparatus and a data write control method for the storage apparatus.

  Some storage apparatuses operate by configuring a Redundant Array of Inexpensive Disks (RAID) using a plurality of disk apparatuses. By configuring the RAID, data can be stored redundantly, and the risk of data loss can be avoided even when a failure occurs in the disk device.

  In addition, since it is assumed that a failure suddenly occurs in the disk device, the storage device is often provided with a hot spare disk device in advance. The hot spare disk device functions to store data in place of a disk device in which a failure has occurred. By providing this hot spare disk device, the storage device can continue to operate even when a failure exceeding the redundancy occurs in a plurality of disk devices constituting the RAID.

  Further, the storage device is generally configured to temporarily store data written from the host device in the cache memory and then write the data to the disk device. Therefore, when the data with the full capacity of the cache memory is cached, the host device cannot write the data, resulting in a decrease in processing efficiency. In order to avoid this, if a dedicated magnetic disk device is placed in the storage device and the capacity of the cache memory becomes full, data can be written to this dedicated magnetic disk device to prevent a reduction in processing efficiency. It is known (see, for example, Patent Document 1).

JP 2000-357060 A

  The storage apparatus can secure data redundancy as described above by configuring RAID. However, for example, when RAID5 and RAID6 are configured as RAID, There is a need to read, update and write data. For this reason, there is a problem that the capacity of the cache memory tends to be saturated, and the processing efficiency of data storage and the like of the storage device is reduced.

  In this regard, according to the technique described in Patent Document 1, it is possible to prevent a reduction in processing efficiency of the storage apparatus by using a dedicated magnetic disk. However, the cost increases due to the provision of a dedicated magnetic disk.

  It is also conceivable to use a memory that can write data at a higher speed as a cache memory. However, such a memory is expensive, and the cost problem cannot be solved.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a storage apparatus and a data write control method for the storage apparatus that can realize a reduction in processing efficiency at a low cost.

  The present invention provides a cache unit that temporarily holds write data, a detection unit that detects whether or not the capacity of the cache unit is saturated, and a plurality of cache units for one data write process. Based on the detection result of the detection unit when receiving the write data from the disk data storage unit that performs data storage processing by reuse, the hot spare disk device of the disk device used for the disk data storage unit, and the host device Determine whether the capacity of the cache unit is saturated. If it is determined that it is not saturated, write data to the disk data storage unit. If it is determined that it is saturated, write data to the hot spare disk device. A controller that writes the written data to a disk data storage unit.

  According to the present invention, it is possible to provide a storage apparatus and a data write control method for the storage apparatus that can realize a reduction in processing efficiency at low cost.

It is a figure which shows the structure of the storage system which concerns on embodiment of this invention. 4 is a flowchart showing data write processing of the storage apparatus according to the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of the storage system 1. The storage system 1 includes a host device 50 and a disk array device 100 that is a storage device.

  The host device 50 transmits a data write or data read command to the disk array device 100, receives a write completion notification in the case of data write, and receives the specified data in the case of data read. Receive from 100.

  The disk array device 100 writes data to the disk device in accordance with a command from the host device 50, transmits a write completion notification to the host device 50 after the writing is completed, or reads specified data from the disk device and reads the read data. Is transmitted to the host device 50. In addition, the disk array device 100 includes a disk unit 110 and a data write instruction unit 101 as shown in FIG.

  The disk unit 110 includes a disk data storage unit 111 and a hot spare group 112.

  The disk data storage unit 111 is composed of a plurality of disk devices, and RAID 5 or RAID 6 is composed of these plurality of disk devices. Therefore, when data is written to the disk data storage unit 111, it is necessary to perform data storage processing by using the cache unit 120 (described later) a plurality of times for processing for writing data once.

  The hot spare group 112 is composed of, for example, two disk devices, and RAID 1 (mirroring) is composed of these two disk devices.

  The data write instruction unit 101 includes a data write control unit 150, a cache unit 120, and a cache free capacity detection unit 130.

  The data writing control unit 150 performs data writing for performing data writing processing. More specifically, when the data write control unit 150 receives write data from the host device 50, the data write control unit 150 determines whether the capacity of the cache unit 120 is saturated based on the detection result of the cache free space detection unit 130. If it is determined that it is not saturated, data is written to the disk data storage unit 111, and if it is determined that it is saturated, data is written to the hot spare group 112, and the written data is written to the disk data storage unit 111. The writing of data to the hot spare group 112 and the writing of the written data to the disk data storage unit 111 are executed in parallel.

  The cache unit 120 temporarily holds write data received from the host device 50. More specifically, the cache unit 120 includes a cache data storage unit 121, and stores data that has undergone a write process from the data write control unit 150 in the cache data storage unit 121.

  The cache free space detection unit 130 detects whether or not the cache data storage unit 121 is in a saturated state where data cannot be stored, and detects that the cache data storage unit 121 is in a saturated state Then, an alarm indicating that is transmitted to the data write control unit 150.

  Next, data write processing in the storage system 1 will be described. FIG. 2 shows processing executed when the data write control unit 150 receives write data from the host device 50.

  When the write data is received from the host device 50, the data write controller 150 determines whether or not the cache data storage unit 121 is saturated based on whether or not an alarm is received from the cache free space detector 130. Is determined (S10).

  When it is determined that the cache data storage unit 121 is not saturated (S10: NO), the data write control unit 150 writes the received write data to the disk data storage unit 111 (S11).

  Next, the data write control unit 150 determines whether or not the writing of the write data has been completed (S12). If it is determined that the writing of the write data has ended (S12: YES), the data write control unit 150 ends this process. On the other hand, when it is determined that the writing of the write data has not ended (S12: NO), the data write control unit 150 continues the process of step S11 described above (S11).

  If it is determined that the cache data storage unit 121 is in a saturated state (S10: NO), the data write control unit 150 writes the write data to the hot spare group 112 (S13). Next, the data write control unit 150 writes the data written in the hot spare group 112 into the disk data storage unit 111 (S14). The data writing to the hot spare group 112 in step S13 and the data writing to the disk data storage unit 111 in step S14 are performed in parallel.

  Next, the data write control unit 150 determines whether or not writing of the write data has been completed (S15). If it is determined that the writing of the write data has ended (S15: YES), the data write control unit 150 ends this process. On the other hand, when it is determined that the writing of the write data has not been completed (S15: NO), the data write control unit 150 continues the processes of steps S13 and S14 described above.

  As a result of the above processing, if the cache data storage unit 121 is not saturated when write data is received from the host device 50, the data write control unit 150 writes the write data to the disk data storage unit 111.

  On the other hand, when the cache data storage unit 121 is saturated when the write data is received from the host device 50, the data write control unit 150 writes the write data to the hot spare group 112, and writes the written data to the disk. The process of writing to the data storage unit 111 is executed in parallel.

  Therefore, according to the disk array device 100 of the present embodiment, when the cache data storage unit 121 is in a saturated state, by using the hot spare disk device of the hot spare group 112, a dedicated magnetic disk device or expensive memory is not used. In other words, it is possible to prevent a reduction in the processing efficiency of the data writing process without cost.

  Therefore, the disk array device 100 can perform processing using a hot spare disk device that can be easily used as a spare even when a situation in which the load suddenly increases, for example, and is a part that is not necessary in normal operation. The cost can be avoided.

  Further, even if a sudden failure occurs in the hot spare group 112 and one hot spare disk device fails, the write data is stored in the other mirrored hot spare disk device, so that the disk array device 100 has redundancy. Can be secured.

  Furthermore, the data write control unit 150 executes writing of the write data to the hot spare group 112 and writing of the written data to the disk data storage unit 111 in parallel to the disk data storage unit 111. The write data can be written at high speed.

  In addition, this invention is not limited to the above-mentioned embodiment, A various deformation | transformation is possible in the case of the implementation.

  A part or all of the above embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
A cache unit for temporarily storing write data;
A detection unit for detecting whether the capacity of the cache unit is in a saturated state;
A disk data storage unit that performs data storage processing by using the cache unit a plurality of times for the processing of writing data once;
A hot spare disk device of a disk device used for the disk data storage unit;
When write data is received from a host device, based on the detection result of the detection unit, it is determined whether the capacity of the cache unit is in a saturated state. When the write data is written to the disk, the controller writes the write data to the hot spare disk device and writes the written data to the disk data storage unit.
A storage apparatus comprising:

(Appendix 2)
The storage device according to appendix 1, wherein the disk data storage unit comprises RAID (Redundant Arrays of Inexpensive Disks) 5 or RAID 6 by a plurality of disk devices.

(Appendix 3)
The storage apparatus according to appendix 1 or 2, wherein the storage apparatus includes at least two hot spare disk devices, and mirroring is configured between the hot spare disk devices.

(Appendix 4)
The control unit executes writing of the write data to the hot spare disk device and writing of the written data to the disk data storage unit in parallel. The storage device according to any one of the above.

(Appendix 5)
A cache unit that temporarily holds write data, a detection unit that detects whether or not the capacity of the cache unit is in a saturated state, and the cache unit is used a plurality of times for writing data once A storage device data write control method comprising: a disk data storage unit that performs data storage processing; and a hot spare disk device of a disk device used in the disk data storage unit,
When receiving write data from a host device, based on a detection result of the detection unit, determining whether the capacity of the cache unit is in a saturated state;
Writing the write data to the disk data storage unit when it is determined that the saturated state is not determined in the determining step;
Writing the write data to the hot spare disk device if it is determined to be saturated in the determining step, writing the written data to the disk data storage unit;
A data write control method for a storage apparatus, comprising:

  The present invention is widely applicable to a storage apparatus for writing write data received from a host apparatus and a data write control method for the storage apparatus.

DESCRIPTION OF SYMBOLS 1 ... Storage system 50 ... Host apparatus 100 ... Disk array apparatus 101 ... Data write instruction | indication part 110 ... Disk part 111 ... Disk data storage part 112 ... Hot spare group 120 ... Cache unit 121 ... Cache data storage unit 130 ... Cache free space detection unit 150 ... Data write control unit

Claims (4)

A cache unit for temporarily storing write data;
A detection unit for detecting whether the capacity of the cache unit is in a saturated state;
And disk data storage unit for performing a process of storing data using a plurality of times the cache unit for a single data of the write processing,
A hot spare disk device of a disk device used for the disk data storage unit;
When write data is received from a host device, based on the detection result of the detection unit, it is determined whether the capacity of the cache unit is in a saturated state. When the write data is written to the disk, the controller writes the write data to the hot spare disk device and writes the written data to the disk data storage unit.
Equipped with a,
The storage device, wherein the control unit executes the writing of the write data to the hot spare disk device and the writing of the written data to the disk data storage unit in parallel .   2. The storage device according to claim 1, wherein the disk data storage unit comprises RAID (Redundant Arrays of Inexpensive Disks) 5 or RAID 6 by a plurality of disk devices.   3. The storage apparatus according to claim 1, wherein at least two of the hot spare disk apparatuses are provided, and mirroring is configured between the hot spare disk apparatuses. A cache unit that temporarily holds write data, a detection unit that detects whether or not the capacity of the cache unit is in a saturated state, and the cache unit is used a plurality of times for writing data once A storage device data write control method comprising: a disk data storage unit that performs data storage processing; and a hot spare disk device of a disk device used in the disk data storage unit,
When receiving write data from a host device, based on a detection result of the detection unit, determining whether the capacity of the cache unit is in a saturated state;
Writing the write data to the disk data storage unit when it is determined that the saturated state is not determined in the determining step;
Writing the write data to the hot spare disk device if it is determined to be saturated in the determining step, writing the written data to the disk data storage unit;
Have,
A data write control method for a storage device, wherein the writing of the write data to the hot spare disk device and the writing of the written data to the disk data storage unit are executed in parallel .

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