Storage control device and method for controlling storage devices

• US 9,395,938 B2
• Filed: 07/11/2014
• Issued: 07/19/2016
• Est. Priority Date: 09/09/2013
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Tsukahara, Ryota, Kubota, Norihide, Igashira, Atsushi, Kobayashi, Kenji, Daikokuya, Hidejirou, Ikeuchi, Kazuhiko, Maeda, Chikashi, Watanabe, Takeshi
• Primary Examiner(s): Lottich, Joshua P
• Application Number:
  US14/328,999
• Publication Number:
  US 20150074452A1
• Time in Patent Office: 739 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 11/0727 in a storage system, e.g. in a DASD or network based storage system drivers for digital recording or reproducing units G06F3/06; circuits for error detection or correction within digital recording or reproducing units G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097
• CPC Class Codes: G06F 11/076 by exceeding a count or rate limit, e.g. word- or bit count limit
• CPC Class Codes: G06F 11/1092 Rebuilding, e.g. when physically replacing a failing disk
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

A storage control device includes a storage unit and a processor. The storage unit is configured to store therein a first score calculated for a first storage device. The processor is configured to add, upon detecting an event occurred in the first storage device, points corresponding to the event to the first score. The processor is configured to determine upon the addition, based on the first score and a second score, whether a sign of failure of the first storage device is detected. The second score is calculated for a first redundant unit of storage devices including the first storage device.

Claims

1. A storage control device, comprising:

a storage unit configured to store therein a first score calculated for a first storage device; and

a processor configured to

add, upon detecting an event occurred in the first storage device, points corresponding to the event to the first score, and

determine upon the addition, based on the first score and a second score, whether a sign of failure of the first storage device is detected, the second score being calculated for a first redundant unit of storage devices including the first storage device.

2. The storage control device according to claim 1, wherein the processor is configured to

perform, upon determining that the sign is detected, duplication of the first storage device to one of spare storage devices.

3. The storage control device according to claim 2, wherein the processor is configured to

preferentially perform the duplication of the first storage device over duplication of a second storage device when a first number of redundant units exceeds a second number of the spare storage devices, the redundant units each including a storage device to be duplicated, a priority of the first redundant unit being higher than a priority of a second redundant unit including the second storage device, the first redundant unit being one of the redundant units, the second redundant unit being another one of the redundant units.

4. The storage control device according to claim 3, wherein the processor is configured to

stop the duplication of the second storage device in progress to start the duplication of the first storage device.

5. The storage control device according to claim 1, wherein the processor is configured to

determine, upon determining that the first score exceeds a first threshold value or that the second score exceeds a second threshold value, that the sign is detected.

6. The storage control device according to claim 5, wherein the processor is configured to

change the first threshold value when the second score exceeds the second threshold value.

7. A method for controlling storage devices, the method comprising:

storing, by a computer, a first score calculated for a first storage device;

adding, upon detecting an event occurred in the first storage device, points corresponding to the event to the first score; and

determining upon the addition, based on the first score and a second score, whether a sign of failure of the first storage device is detected, the second score being calculated for a first redundant unit of storage devices including the first storage device.

8. The method according to claim 7, further comprising:

performing, upon determining that the sign is detected, duplication of the first storage device to one of spare storage devices.

9. The method according to claim 8, further comprising:

preferentially performing the duplication of the first storage device over duplication of a second storage device when a first number of redundant units exceeds a second number of the spare storage devices, the redundant units each including a storage device to be duplicated, a priority of the first redundant unit being higher than a priority of a second redundant unit including the second storage device, the first redundant unit being one of the redundant units, the second redundant unit being another one of the redundant units.

10. The method according to claim 9, further comprising:

stopping the duplication of the second storage device in progress to start the duplication of the first storage device.

11. The method according to claim 7, further comprising:

determining, upon determining that the first score exceeds a first threshold value or that the second score exceeds a second threshold value, that the sign is detected.

12. The method according to claim 11, further comprising:

changing the first threshold value when the second score exceeds the second threshold value.

13. A non-transitory computer-readable recording medium having stored therein a program for causing a computer to execute a process, the process comprising:

storing a first score calculated for a first storage device;

adding, upon detecting an event occurred in the first storage device, points corresponding to the event to the first score; and

determining upon the addition, based on the first score and a second score, whether a sign of failure of the first storage device is detected, the second score being calculated for a first redundant unit of storage devices including the first storage device.

14. The non-transitory computer-readable recording medium according to claim 13, the process further comprising:

performing, upon determining that the sign is detected, duplication of the first storage device to one of spare storage devices.

15. The non-transitory computer-readable recording medium according to claim 14, the process further comprising:

preferentially performing the duplication of the first storage device over duplication of a second storage device when a first number of redundant units exceeds a second number of the spare storage devices, the redundant units each including a storage device to be duplicated, a priority of the first redundant unit being higher than a priority of a second redundant unit including the second storage device, the first redundant unit being one of the redundant units, the second redundant unit being another one of the redundant units.

16. The non-transitory computer-readable recording medium according to claim 15, the process further comprising:

stopping the duplication of the second storage device in progress to start the duplication of the first storage device.

17. The non-transitory computer-readable recording medium according to claim 13, the process further comprising:

determining, upon determining that the first score exceeds a first threshold value or that the second score exceeds a second threshold value, that the sign is detected.

18. The non-transitory computer-readable recording medium according to claim 17, the process further comprising:

changing the first threshold value when the second score exceeds the second threshold value.