Methods for managing ownership of redundant data and systems thereof

• US 8,650,361 B2
• Filed: 08/07/2013
• Issued: 02/11/2014
• 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:
  US13/961,824
• Publication Number:
  US 20130326138A1
• Time in Patent Office: 188 Days
• Field of Search: 711/118, 707/661, 707/956, 707/809
• US Class Current: 711/118
• 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 3/0608 Saving storage space on storage systems
• CPC Class Codes: G06F 3/0655 Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

A storage system according to one embodiment includes logic integrated with and/or executable by a hardware processor, the logic being configured to: determine an ownership status for each of a plurality of instances of a file in a first storage tier and in a second storage tier of the storage system; determine locations of the instances of the file in the storage system; determine whether the instances of the file in the first storage tier are being accessed or not being accessed; and assign each of the instances of the file to one of a plurality of indices using the determined ownership status, location, and whether the instances are being accessed.

Claims

1. A storage system, comprising:

logic integrated with and/or executable by a hardware processor, the logic being configured to;

determine an ownership status for each of a plurality of instances of a file in a first storage tier and in a second storage tier of the storage system, wherein the ownership status includes owned and unowned;

determine locations of the instances of the file in the storage system;

determine whether the instances of the file in the first storage tier are being accessed or not being accessed; and

assign each of the instances of the file to one of a plurality of indices using the determined ownership status, location, and whether the instances are being accessed.

2. The storage system as recited in claim 1, wherein the plurality of indices include:

a first index, which represents an instance of the file on the first storage tier which is currently being accessed by a user associated therewith;

a second index, which represents an instance of the file on the first storage tier which is not being accessed by a user associated therewith;

a third index, which represents an instance of the file on the second storage tier which is not being accessed by a user associated therewith;

a fourth index, which represents an instance of the file on the first storage tier which is not being accessed and is not associated with a user; and

a fifth index, which represents an instance of the file on the second storage tier which is not being accessed and is not associated with a user.

3. The storage system as recited in claim 2, wherein the logic if further configured to:

transfer an ownership status of an instance of the file in the second index from associated with a first user to associated with the user requesting access to the file;

transfer an index assignment of an instance of the file in the second index to the first index; and

transfer an ownership status of an instance of the file in the third index from associated with the user requesting access to the file to associated with the first user.

4. The storage system as recited in claim 2, wherein an instance of the file on the first storage tier having an index assignment of the fourth index is created by replicating an instance of the file having an index assignment of the first index in the first storage tier or any instance of the file in the second storage tier.

5. The storage system as recited in claim 2, wherein the logic is further configured to:

receive a request to access the file or instance thereof from a user;

select one of the instances of the file based on an assignment of the instance of the file to one of the indices; and

provide the user with access to the selected instance of the file or copy thereof.

6. The storage system as recited in claim 5, wherein the selected instance of the file or copy thereof is selected by attempting to select an instance of the file in order from the fourth index, then from the second index, then from the first index, then from the fifth index, and then from the third index.

7. The storage system as recited in claim 6, wherein when the selected instance of the file is selected from the first index, the fifth index, or the third index, a copy of the selected instance is created in the first storage tier and access thereof is provided.

8. The storage system as recited in claim 1, wherein the logic is further configured to:

associate each user to a unique user identifier and store the association in a first index;

associate each instance of the file on the storage system to a unique user via the unique user identifiers and store the association in a second index; and

associate each instance of the file on the storage system to one usage status related to usage of the instance of the file and store the association in a third index.

9. The storage system as recited in claim 1, wherein the file and instances thereof include video data from a broadcast.

10. The storage system as recited in claim 1, wherein the plurality of indices include:

a first index which represents an instance of the file on the first storage tier which is currently being accessed by a user associated therewith;

a second index which represents an instance of the file on the first storage tier which is not being accessed by a user associated therewith; and

a third index which represents an instance of the file on the second storage tier which is not being accessed by a user associated therewith.

11. The storage system as recited in claim 10, wherein the logic is further configured to:

transfer an ownership status of an instance of the file in the second index from associated with a first user to associated with the user requesting access to the file;

transfer an index assignment of an instance of the file in the second index to the first index; and

transfer an ownership status of an instance of the file in the third index from associated with the user requesting access to the file to associated with the first user.

12. The storage system as recited in claim 10, wherein selection of an instance of the file includes attempting to select an instance of the file in order from the second index, then from the first index, and then from the third index.

13. The storage system as recited in claim 12, wherein when the selected instance of the file is selected from the first index or the third index, a copy of the selected instance is created in the first storage tier and access thereof is provided.

14. The storage system as recited in claim 1, further comprising the first and second storage tiers.

15. A method, comprising:

determining an ownership status for each of a plurality of instances of a file in a first storage tier and in a second storage tier of a storage system, wherein the ownership status includes owned and unowned;

determining locations of the instances of the file in the storage system;

determining whether the instances of the file in the first storage tier are being accessed or not being accessed; and

assigning each of the instances of the file to one of a plurality of indices using the determined ownership status, location, and whether the instances are being accessed.

16. The method as recited in claim 15, further comprising:

receiving a request to access the file or instance thereof from a requestor;

selecting one of the instances of the file based on an assignment of the instance of the file to one of the indices; and

providing the requestor with access to the selected instance of the file or copy thereof.

17. The method as recited in claim 15, wherein the plurality of indices include:

a first index, which represents an instance of the file on the first storage tier which is currently being accessed by a user associated therewith;

a second index, which represents an instance of the file on the first storage tier which is not being accessed by a user associated therewith;

a third index, which represents an instance of the file on the second storage tier which is not being accessed by a user associated therewith;

a fourth index, which represents an instance of the file on the first storage tier which is not being accessed and is not associated with a user; and

a fifth index, which represents an instance of the file on the second storage tier which is not being accessed and is not associated with a user.

18. The method as recited in claim 15, wherein the plurality of indices include:

a first index which represents an instance of the file on the first storage tier which is currently being accessed by a user associated therewith;

a second index which represents an instance of the file on the first storage tier which is not being accessed by a user associated therewith; and

a third index which represents an instance of the file on the second storage tier which is not being accessed by a user associated therewith.

19. A computer program product for managing a storage system, the computer program product comprising a non-transitory computer readable storage medium having program code embodied therewith, the program code readable/executable by a processor to:

determine an ownership status for each of a plurality of instances of a file in a first storage tier and in a second storage tier of the storage system, wherein the ownership status includes owned and unowned;

determine locations of the instances of the file in the storage system;

determine whether the instances of the file in the first storage tier are being accessed or not being accessed; and

assign each of the instances of the file to one of a plurality of indices using the determined ownership status, location, and whether the instances are being accessed.

20. The computer program product as recited in claim 19, wherein the program code is further readable/executable by the processor to:

receive a request to access the file or instance thereof from a user;

select one of the instances of the file based on an assignment of the instance of the file to one of the indices; and

provide the user with access to the selected instance of the file or copy thereof.