Data restoring method and an apparatus using journal data and an identification information

• US 7,305,584 B2
• Filed: 02/24/2006
• Issued: 12/04/2007
• Est. Priority Date: 02/20/2003
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Mogi, Kazuhiko, Oeda, Takashi, Yamamoto, Yasutomo, Eguchi, Yoshiaki, Arai, Kouji
• Primary Examiner(s): Bonzo; Bryce P.
• Assistant Examiner(s): GUYTON, PHILIP A
• Application Number:
  US11/360,426
• Publication Number:
  US 20060150001A1
• Time in Patent Office: 648 Days
• Field of Search: 714/15
• US Class Current: 714/15
• CPC Class Codes: G06F 11/142 Reconfiguring to eliminate the error group management mechanisms in a peer-to-peer network H04L67/1044
• CPC Class Codes: G06F 11/1469 Backup restoration techniques
• CPC Class Codes: G06F 11/1471 involving logging of persistent data for recovery
• CPC Class Codes: Y10S 707/99953 Recoverability

Abstract

A host and a storage system each keep a shared identifier indicating a state of a system. The storage system acquires, at update of data, a data pair including data for a change through processing of the host and data before the update. The storage system relates the data pair to a shared identifier. When the host indicates an identifier, the storage system restores data using the data pair.

Claims

1. An information processing system comprising:

a computer; and

a storage system, which is coupled to the computer and which receives a write request from the computer;

wherein the storage system further comprising;

a control unit processing the write request from the computer;

a first storage which stores data related to the write request targeted to the first storage from the computer;

a second storage, coupled to the control unit, which stores a copy of data of the first storage at a particular point in time; and

a third storage, coupled to the control unit, which records write data related to the write request targeted to the first storage from the computer with time information and/or sequence numbers, and a plurality of checkpoints in time for recovery, as journal data of the first storage, wherein the checkpoints identify a system state at detections of certain types of transactions;

wherein when the control unit receives a restoration request including a desired checkpoint information specifying one of the plurality of checkpoints, the information processing system generates an image of the first storage at a desired point in time specified with the desired checkpoint information based upon the copied data stored in the second storage, and journal data which are stored in the third storage and which are specified by the desired checkpoint and the particular point in time.

2. An information processing system according to claim 1, wherein one of the certain types of transactions is forcibly writing dirty data of the computer to the storage system.

3. An information processing system according to claim 1, wherein the first, second, and third storages are logical storages.

4. An information processing system according to claim 1, wherein the information processing system further comprises a management terminal including a display for displaying thereon information regarding the checkpoint information.

5. An information processing system according to claim 4, wherein the management terminal includes an input unit and transmits the checkpoint information specified by information inputted from the input unit so that the third storage stores the checkpoint information.

6. An information processing system according to claim 1, wherein the checkpoint information contains information corresponding to the processing time information and/or processing sequence numbers.

7. An information processing system according to claim 1, wherein one of the certain types of transactions creating the checkpoints is a transaction for closing a file.

8. An information processing system according to claim 1, wherein the generating of the image of the first storage is performed in response to a restoration request from a management computer.

9. An information processing system according to claim 1, further comprising displaying information regarding the checkpoint information which is stored as the journal data.

10. An information processing system comprising:

a computer; and

a storage system, which is coupled to the computer and which receives a write request from the computer;

wherein the storage system further comprises;

a control unit processing the write request from the computer;

a first storage which stores data related to the write request targeted to the first storage from the computer;

a second storage which is coupled to the control unit and which stores a copy of data of the first storage at a particular point in time; and

a third storage which is coupled to the control unit and which records, write data related to the write request targeted to the first storage from the computer with time information and/or sequence numbers, and a plurality of checkpoints in time for recovery, as journal data of the first storage, wherein the checkpoints identify a system state in which at least one of flush operations from the computer to the storage system is executed,

wherein when the control unit receives a restoration request including a desired checkpoint information specifying one of the plurality of checkpoints, the information processing system generates an image of the first storage at a desired point in time specified with the desired checkpoint information based upon the copied data stored in the second storage, and journal data which are stored in the third storage and which are specified by the desired checkpoint and the particular point in time.

11. An information processing system according to claim 10, wherein the system state is one in which dirty data of the computer is forcibly written to the storage system.

12. An information processing system according to claim 10, wherein the first, second, and third storages are logical storages.

13. An information processing system according to claim 10, wherein the information processing system further comprises a management terminal including a display for displaying thereon information regarding the checkpoint information.

14. An information processing system according to claim 10, wherein the management terminal includes an input unit and transmits the checkpoint information specified by information inputted from the input unit to the storage system.

15. An information processing system according to claim 10, wherein the checkpoint information contains information corresponding to the processing time information and/or processing sequence numbers.

16. An information processing system according to claim 10, wherein one of the checkpoints is created at the system state corresponding to a closing of a file.

17. An information processing system according to claim 10, wherein the generating of the image of the first storage is performed in response to a restoration request from a management computer.

18. An information processing system according to claim 10, further comprising displaying information regarding the checkpoint information which is stored as the journal data.

19. An information processing system according to claim 10, wherein in order to record the plurality of checkpoints in time for recovery in the third storage, checkpoint information is sent from the computer to the storage system.

20. A storage system, to be coupled to a computer, receiving a write request from the computer, the storage system comprising:

a control unit processing the write request from the computer;

a first storage which stores data related to the write request targeted to the first storage from the computer;

a second storage which is coupled to the control unit and which stores a copy of data of the first storage; and

a third storage which is coupled to the control unit and which records write data related to the write request targeted to the first storage from the computer with time information and/or sequence numbers, and a plurality of checkpoints in time for recovery, as journal data of the first storage, wherein the checkpoints uniquely identify a system state;

wherein when the control unit receives a restoration request including a desired checkpoint information specifying one of the plurality of checkpoints, the storage system generates an image of the first storage at a desired point in time specified with the desired checkpoint information based upon the copied data stored in the second storage, and appropriate journal data stored in the third.

21. A storage system according to claim 20, wherein the system state is one in which dirty data of the computer is forcibly written to the storage system.

22. A storage system according to claim 20, wherein the first, second, and third storages are logical storages.

23. A storage system according to claim 20, wherein the storage system further comprises a management terminal including a display for displaying thereon information regarding the checkpoint information.

24. A storage system according to claim 20, wherein the management terminal includes an input unit and transmits the checkpoint information specified by information inputted from the input unit so that the third storage stores the checkpoint information.

25. A storage system according to claim 20, wherein the checkpoint information contains information corresponding to the processing time information and/or processing sequence numbers.

26. An information processing system according to claim 20, wherein one of the checkpoints is created at the system state corresponding to a closing of a file.

27. An information processing system according to claim 20, wherein the generating of the image of the storage is performed in response to a restoration request from a management computer.

28. An information processing system according to claim 20, further comprising displaying information regarding the checkpoint information which is stored as the journal data.

29. A storage system according to claim 20, wherein in order to record the plurality of checkpoints in time for recovery in the third storage, the storage system receives checkpoint information from the computer.

30. A computer program stored on at least one computer readable storage medium and implemented in a storage system including a controller processing a write request from a computer which is to be coupled to the storage system and a first storage which stores data related to the write request to the first storage from the computer, the computer program comprising:

code for storing a copy of data of the first storage in a second storage of the storage system,

code for recording write request to the first storage from the computer with time information and/or sequence numbers, and a plurality of checkpoints in time for recovery, as journal data of the first storage, wherein the checkpoints uniquely identify a system state, and

code for generating an image of the first storage at a desired point in time specified with the desired checkpoint information based upon the copied data stored in the second storage, and appropriate journal data stored in the third storage when the controller receives a restoration request including a desired checkpoint information specifying one of the plurality of checkpoints.

31. A computer program according to claim 30, wherein the system state is one in which dirty data of the computer is forcibly written to the storage system.

32. A computer program according to claim 30, wherein the first, second, and third storages are logical storages.

33. A computer program according to claim 30, wherein the checkpoint information contains information corresponding to the processing time information and/or processing sequence numbers.

34. A computer program according to claim 30, further comprising a code for displaying information regarding the checkpoint information which is stored as the journal data.

35. A computer program according to claim 30, wherein the plurality of checkpoints in time for recovery are recorded according to checkpoint information received at the storage system from the computer.

36. A computer program stored on at least one computer readable storage medium and implemented in a storage system including a controller processing a write request from a computer which is to be coupled to the storage system and a first storage which stores data related to the write request to the first storage from the computer, the computer program comprising:

code for storing a copy of data of the first storage in a second storage of the storage system,

code for recording write request to the first storage from the computer with time information and/or sequence numbers, and a plurality of checkpoints in time for recovery, as journal data of the first storage, wherein the checkpoints identify a system state at detections of certain types of transactions, and

code for generating an image of the first storage at a desired point in time specified with the desired checkpoint information based upon the copied data stored in the second storage, and appropriate journal data stored in the third storage when the controller receives a restoration request including a desired checkpoint information specifying one of the plurality of checkpoints.

37. A computer program according to claim 36, wherein one of the certain types of transactions is forcibly writing dirty data of the computer to the storage system.

38. A computer program according to claim 36, wherein the first, second, and third storages are logical storages.

39. A computer program according to claim 36, wherein the checkpoint information contains information corresponding to the processing time information and/or processing sequence numbers.

40. A computer program according to claim 36, further comprising a code for displaying information regarding the checkpoint information which is stored as the journal data.

41. A commuter program according to claim 36, wherein the plurality of checkpoints in time for recovery are recorded according to checkpoint information received at the storage system from the computer.