Storage control device and storage control method

• US 8,418,029 B2
• Filed: 06/15/2010
• Issued: 04/09/2013
• Est. Priority Date: 06/29/2009
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Daikokuya, Hidejirou
• Primary Examiner(s): Kerveros, James C
• Application Number:
  US12/815,762
• Publication Number:
  US 20100332947A1
• Time in Patent Office: 1,029 Days
• Field of Search: 714/763
• US Class Current: 714/763
• CPC Class Codes: G06F 11/1008 in individual solid state devices G06F11/1004 takes precedence
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H03M 13/17 Burst error correction, e.g. error trapping, Fire codes

Abstract

A storage control apparatus includes a storage unit having a plurality of blocks for storing data, each of the plurality of blocks being detected for data error by an error check code (ECC), a processor to execute a process to at least, modify an ECC stored in one of the storage unit, detect data-reading error in at least one block in the storage unit based on the modified ECC, and determine the number of detected blocks in the storage unit.

Claims

1. A storage control apparatus, comprising:

a storage unit having a plurality of blocks for storing data, an error check code to detect data error in each of the plurality of blocks,

a processor to execute a process to at least;

modify an error check code stored in the storage unit,

detect each of the plurality of blocks in which a data reading error occurs in the storage unit based on the modified error check code, and

determine the number of detected blocks in the storage unit.

2. The storage control apparatus according to claim 1, further comprising:

a plurality of storage units, each having a plurality of blocks for storing data, an error check code to detect data error in each of the plurality of blocks.

3. The storage control apparatus according to claim 2, wherein the data stored in a block of one of the plurality of storage units is restorable by using data stored in a block of another of the plurality of storage units.

4. The storage control apparatus according to claim 3, wherein the processor to execute the process to further:

identify a recovering range of blocks in the one of the plurality of storage units based on the determined number of detected blocks.

5. The storage control apparatus according to claim 4, wherein the processor to execute the process to further:

restore the data stored in the blocks in accordance with one of the error check code stored in one of the plurality of storage units on the basis of the determined number of the block of the one of the plurality of storage units.

6. The storage control apparatus according to claim 1, wherein the processor to execute the process to further:

read the data and the error check code corresponding to the data from the storage unit.

7. The storage control apparatus according to claim 1, wherein the processor to execute the process to further:

write the data and the modified error check code corresponding to the data into the storage unit.

8. The storage control apparatus according to claim 1, wherein the storage unit is solid state disk.

9. The storage control apparatus according to claim 1, wherein the processor to execute the process to further:

repeatedly and sequentially read data from the blocks until the normal response is returned.

10. A non-transitory computer readable medium storing a management program for controlling a storage control apparatus including a storage unit having a plurality of blocks for storing data, an error check code to detect data error in each of the plurality of blocks, a process executed by the storage control apparatus comprising:

modifying an error check code stored in the storage unit,

detecting each of the plurality of blocks in which a data reading error occurs in the storage unit based on the modified error check code, and

determining the number of detected blocks in the storage unit.

11. The non-transitory computer readable medium according to claim 10, wherein the storage control apparatus further includes a plurality of storage units, each having a plurality of blocks for storing data, an error check code to detect data error in each of the plurality of blocks.

12. The non-transitory computer readable medium according to claim 11, wherein the data stored in a block of one of the plurality of storage units is restorable by using data stored in a block of another of the plurality of storage units.

13. The non-transitory computer readable medium according to claim 12, wherein the process further executes identifying a recovering range of blocks in the one storage unit based on the determined number of detected blocks.

14. The non-transitory computer readable medium according to claim 13, wherein the process further executes restoring the data stored in the blocks in accordance with one of the error check code stored in one of the plurality of storage units on the basis of the determined number of the block of the one of the plurality of storage units.

15. The non-transitory computer readable medium according to claim 10, wherein the process further executes reading the data and the ECC corresponding to the data from the storage unit.

16. The non-transitory computer readable medium according to claim 10, wherein the process further executes writing the data and the modified ECC corresponding to the data into the storage unit.

17. The non-transitory computer readable medium according to claim 10, wherein the storage unit is solid state disk.

18. The non-transitory computer readable medium according to claim 10, wherein the process further executes repeatedly and sequentially reading data from the blocks until the normal response is returned.