Methods for managing ownership of redundant data and systems thereof

• US 8,612,682 B2
• Filed: 09/29/2010
• Issued: 12/17/2013
• Est. Priority Date: 09/29/2010
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Jaquette, Glen A.
• Primary Examiner(s): Bragdon, Reginald
• Assistant Examiner(s): Ahmed, Hamdy S
• Application Number:
  US12/894,008
• Publication Number:
  US 20120079223A1
• Time in Patent Office: 1,175 Days
• Field of Search: 711/117
• US Class Current: 711/117
• CPC Class Codes: G06F 11/1076 Parity data used in redundant arrays of independent storages, e.g. in RAID systems
• CPC Class Codes: G06F 11/2094 Redundant storage or storage space G06F11/2056 takes precedence
• CPC Class Codes: G06F 16/185 Hierarchical storage management [HSM] systems, e.g. file migration or policies thereof details of archiving G06F16/11
• CPC Class Codes: G06F 2211/1059 Parity-single bit-RAID5, i.e. RAID 5 implementations
• CPC Class Codes: G06F 2211/108 RAIT, i.e. RAID on tape drive

Abstract

A storage system according to one embodiment includes a first storage tier; an intermediate storage tier; a second storage tier; logic for storing instances of a file in the first storage tier, the intermediate storage tier, and the second storage tier; logic for determining which of a plurality of instances of the file in the first storage tier are to be migrated to the second storage tier; logic for copying one instance of the file from the first storage tier to the intermediate storage tier; and logic for copying the instance of the file from the intermediate storage tier to the second storage tier for creating an instance of the file on the second storage tier for each instance of the file on the first storage tier that is to be migrated to the second storage tier. Additional systems, methods, and computer program products are also presented.

Claims

1. A storage system, comprising:

a first storage tier;

an intermediate storage tier;

a second storage tier;

logic for storing instances of a file in the first storage tier, the intermediate storage tier, and the second storage tier;

logic for determining which of a plurality of instances of the file in the first storage tier are to be migrated to the second storage tier;

logic for copying one instance of the file from the first storage tier to the intermediate storage tier; and

logic for copying the instance of the file from the intermediate storage tier to the second storage tier for creating multiple instances of the file on the second storage tier thereby creating a unique instance of the file on the second storage tier for each instance of the file on the first storage tier that is to be migrated to the second storage tier.

2. The storage system as recited in claim 1, wherein the logic for determining includes determining which instances of the file on the first storage tier have not been accessed by any user associated therewith for a predetermined period of time.

3. The storage system as recited in claim 2, wherein the determining is based at least in part on an amount of instances of the file on the first storage tier and an access rate of those instances of the file on the first storage tier.

4. The storage system as recited in claim 1, wherein the instance of the file in the intermediate storage tier is not immediately copied to the second storage tier but is copied to the second storage tier after one of the following:

write/read volume on the storage system is below a threshold, a predetermined period of time has passed, and a complete instance of the file is available on the intermediate storage tier.

5. The storage system as recited in claim 1, wherein the first storage tier includes at least one random access storage medium, wherein the intermediate storage tier includes at least one random access storage medium, and wherein the second storage tier includes at least one sequential access storage medium.

6. The storage system as recited in claim 1, wherein the instance of the file in the intermediate storage tier is not deleted until all instances of the file in the first storage tier to be migrated have been migrated to the second storage tier.

7. The storage system as recited in claim 1, wherein the second storage tier uses less expensive and/or slower-to-access storage media than the first storage tier.

8. The storage system as recited in claim 1, further comprising:

logic for setting ownership statuses of the instances of the file created in the second storage tier to owned by users which owned instances of the file on the first storage tier; and

logic for setting ownership statuses of the instances of the file on the first storage tier from owned by the users to unowned.

9. A method, comprising:

determining which of a plurality of instances of a file in a first storage tier of a storage system are to be migrated to a second storage tier of the storage system, the second storage tier using less expensive and/or slower-to-access storage media than the first storage tier;

copying one instance of the file from the first storage tier to an intermediate storage tier of the storage system;

copying the instance of the file from the intermediate storage tier to the second storage tier for creating an instance of the file on the second storage tier for each instance of the file on the first storage tier that is to be migrated to the second storage tier.

10. The method as recited in claim 9, wherein the determining includes determining which instances of the file on the first storage tier have not been accessed by any user associated therewith for a predetermined period of time.

11. The method as recited in claim 10, wherein the determining is based at least in part on an amount of instances of the file on the first storage tier and an access rate of those instances of the file on the first storage tier.

12. The method as recited in claim 9, wherein the instance of the file in the intermediate storage tier is not immediately copied to the second storage tier but is copied to the second storage tier after one of the following:

write/read volume on the storage system is below a threshold, a predetermined period of tune has passed, and a complete instance of the file is available on the intermediate storage tier.

13. The method as recited in claim 9, wherein the first storage tier includes at least one random access storage medium, wherein the intermediate storage tier includes at least one random access storage medium, and wherein the second storage tier includes at least one sequential access storage medium.

14. The method as recited in claim 9, wherein the instance of the file in the intermediate storage tier is not deleted until all instances of the file in the first storage tier to be migrated have been migrated to the second storage tier.

15. The method as recited in claim 9, further comprising copying the instance of the file from the intermediate storage tier to the second storage tier for creating multiple instances of the file on the second storage tier thereby creating a unique instance of the file on the second storage tier for each instance of the file on the first storage tier that is to be migrated to the second storage tier.

16. The method as recited in claim 9, further comprising:

setting ownership statuses of the instances of the file created in the second storage tier to owned by users which owned instances of the file on the first storage tier; and

setting ownership statuses of the instances of the file on the first storage tier from owned by the users to unowned.

17. A computer program product for managing a storage system, the computer program product comprising:

a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising;

computer readable program code configured to store instances of a file in a first storage tier, an intermediate storage tier, and a second storage tier of a storage system, the second storage tier using less expensive and/or slower-to-access storage media than the first storage tier;

computer readable program code configured to determine which of a plurality of instances of the file in the first storage tier are to be migrated to the second storage tier;

computer readable program code configured to copy one instance of the file from the first storage tier to the intermediate storage tier; and

computer readable program code configured to copy the instance of the file from the intermediate storage tier to the second storage tier for creating multiple instances of the file on the second storage tier thereby creating a unique instance of the file on the second storage tier for each instance of the file on the first storage tier that is to be migrated to the second storage tier.

18. The computer program product as recited in claim 17, wherein the computer readable program code configured to determine is based at least in part on an amount of instances of the file on the first storage tier and an access rate of those instances of the file on the first storage tier.

19. The computer program product as recited in claim 18, wherein the file and instances thereof include video data from a broadcast.

20. The computer program product as recited in claim 17, wherein the instance of the file in the intermediate storage tier is not deleted until all instances of the file in the first storage tier to be migrated have been migrated to the second storage tier.