Disk management method, disk management device and storage system

• US 7,925,919 B2
• Filed: 09/22/2008
• Issued: 04/12/2011
• Est. Priority Date: 10/30/2007
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Igashira, Atsushi, Maeda, Chikashi, Nakagami, Tsuyoshi, Noda, Yuji, Konta, Yoshihito, Daikokuya, Hidejirou, Kubota, Norihide, Ito, Mikio, Takahashi, Hideo, Ikeuchi, Kazuhiko
• Primary Examiner(s): McCarthy; Christopher S
• Application Number:
  US12/234,940
• Publication Number:
  US 20090113236A1
• Time in Patent Office: 932 Days
• Field of Search: None
• US Class Current: 714/6.1
• CPC Class Codes: G06F 11/2082 Data synchronisation
• CPC Class Codes: G11B 20/1803 by redundancy in data representation
• CPC Class Codes: G11B 2020/1823 wherein a flag is set when errors are detected or qualified
• CPC Class Codes: G11B 2220/41 Flat as opposed to hierarchical combination, e.g. library of tapes or discs, CD changer, or groups of record carriers that together store one title
• CPC Class Codes: G11B 2220/415 Redundant array of inexpensive disks [RAID] systems

Abstract

A disk management method for managing a disk management device for writing and reading data to and from a disk drive in which a recording medium is managed in a first control unit. The disk management method includes an error checking operation for checking an error on the recording medium in the first control unit, an error correction operation for correcting the error detected in the error, an error correcting operation for correcting the error detected in the error checking operation after converting data including the error to the second control unit, a data loss registration operation for registering a region in which data are lost due to an inconsistency between the first control unit and second control unit in a data loss region table, and a data loss recovery operation for recovering the loss of data with reference to the data loss region table.

Claims

1. A disk management method for managing a disk management device for writing and reading data to and from a disk drive, in which a recording medium is managed in a first control unit, the disk management method comprising:

checking an error on said recording medium in said first control unit;

correcting the error detected in said error checking operation after converting data including the error to a second control unit;

registering a region in which data are lost due to an inconsistency between said first control unit and second control unit in a data loss region table; and

recovering the loss of data with reference to the data loss region table.

2. The disk management method according to claim 1, further comprising:

referring to said data loss region table in checking said recording medium cyclically for an error; and

recovering the region when the data loss region of said recording medium is registered in the data loss region table.

3. The disk management method according to claim 1, further comprising:

referring to said data loss region table when a read request to a specific disk is issued; and

recovering the region when the data loss region of the disk is registered in said data loss region table.

4. The disk management method according to claim 1,

wherein said disk drive has a redundant configuration, and a region in which an error occurs or data are lost is recovered using said redundant configuration during said error correcting or the lost data recovering.

5. The disk management method according to claim 1,

wherein said data is block data.

6. A disk management method for managing a disk management device for writing and reading data to and from a disk drive, in which a recording medium is managed in a first control unit, the disk management method comprising:

checking an error on said recording medium in said first control unit;

correcting the error detected in said error checking operation after converting data including the error to a second control unit;

registering a region in which data are lost due to an inconsistency between said first control unit and second control unit in a data loss region table;

recovering the loss of data with reference to the data loss region table; and

recovering the data loss region registered in said data loss region table by simulating an error occurrence in the region and deleting a registration of the region from said data loss region table.

7. The disk management method according to claim 6, further comprising:

deleting the registration of the data loss region in said data loss region table when a write request to a specific disk is issued and the region corresponds to the write request.

8. The disk management method according to claim 6,

wherein said recording medium is partitioned by said first control unit by 512 bytes as a block and said second control unit partitions said recording medium by 520 bytes as a block.

9. A disk management device for managing writing and reading data to and from a disk drive in a second control unit, in which a recording medium is managed in a first control unit, the disk management device comprising:

an error checker for checking an error on said recording medium in said first control unit;

an error corrector for correcting the error detected by said error checker after converting data including the error into said second control unit;

a data loss region table for storing a region in which data are lost due to an inconsistency between the first control unit and the second control unit; and

a data loss recovery unit for recovering a data loss with reference to said data loss region table.

11. The disk management device according to claim 9,

wherein said data loss recovery unit refers to said data loss region table where a read request to a specific disk is issued.

12. The disk management device according to claim 9,

wherein said disk drive has a redundant configuration and said error corrector or data loss recovery unit recover a region in which an error occurs or data are lost by using said redundant configuration.

13. The disk management device according to claim 9,

wherein said data loss recovery unit refers to said data loss region table in checking said recording medium cyclically for an error.

10. A disk management device for managing writing and reading data to and from a disk drive in a second control unit, in which a recording medium is managed in a first control unit, the disk management device comprising:

an error checker for checking an error on said recording medium in said first control unit;

an error corrector for correcting the error detected by said error checker after converting data including the error into said second control unit;

a data loss region table for storing a region in which data are lost due to an inconsistency between the first control unit and the second control unit; and

a data loss recovery unit for recovering a data loss with reference to said data loss region table;

wherein said data loss recovery unit reports that an error occurs in the region registered in said data loss region table to said error corrector to correct the error and then deletes a registration of the data loss region from said data loss region table.

14. The disk management device according to claim 10,

wherein a registration of a data loss region registered in the data loss region table is deleted when a write request to a specific disk is issued and the region corresponds to the write request.

15. A storage system comprising a disk drive for managing a recording medium in a first control unit and a disk management device for managing writing and reading data to and from said disk drive in a second control unit, in which a recording medium is managed in a first control unit, the storage system comprising:

an error checker for checking said recording medium for an error in said first control unit;

an error corrector for correcting the error detected by said error checker after converting data including the error into said second control unit;

a data loss region table for storing a region in which data are lost due to the inconsistency between said first control unit and the second control unit; and

a data loss recovery unit for recovering a data loss with reference to said data loss region table.

16. The storage system according to claim 15,

wherein said data loss recovery unit refers to said data loss region table in checking said recording medium cyclically for an error.

17. The storage system according to claim 15,

wherein said data loss recovery unit refers to said data loss region table when a read request to a specific disk is issued.

18. The storage system according to claim 15,

wherein said disk drive has a redundant configuration and said error corrector or data loss recovery unit recover a region in which an error occurs or data are lost by using said redundant configuration.

19. A storage system comprising a disk drive for managing a recording medium in a first control unit and a disk management device for managing writing and reading data to and from said disk drive in a second control unit, in which a recording medium is managed in a first control unit,

the storage system comprising:

an error checker for checking said recording medium for an error in said first control unit;

an error corrector for correcting the error detected by said error checker after converting data including the error into said second control unit;

a data loss region table for storing a region in which data are lost due to the inconsistency between said first control unit and the second control unit; and

a data loss recovery unit for recovering a data loss with reference to said data loss region table;

wherein said data loss recovery unit reports that an error occurs in a region registered in said data loss region table to said error corrector to recover the error and then deletes a registration of the data loss region from said data loss region table.

20. The storage system according to claim 19,

wherein a registration of a region registered in said data loss region table is deleted when a write request to a specific disk is issued and the region corresponds to the write request.