Managing ownership of redundant data

• US 9,256,630 B2
• Filed: 05/09/2014
• Issued: 02/09/2016
• 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): Perveen, Rehana
• Assistant Examiner(s): BUI, THUY T
• Application Number:
  US14/274,356
• Publication Number:
  US 20140250129A1
• Time in Patent Office: 641 Days
• Field of Search: 707/758
• US Class Current: 1/1
• CPC Class Codes: G06F 16/2228 Indexing structures
• CPC Class Codes: G06F 16/24 Querying
• CPC Class Codes: H04N 21/2181 comprising remotely distributed storage units, e.g. when movies are replicated over a plurality of video servers distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097
• CPC Class Codes: H04N 21/23116 involving data replication, e.g. over plural servers synchronization of replicated data G06F11/1658; error detection or correction by means of data replication G06F11/2053; replication in distributed file systems G06F16/10; replication in distributed file systems G06F16/27; replication or mirroring of data in data networks H04L67/1095

Abstract

According to one embodiment, a method includes storing instances of a file in a first storage tier and a second storage tier of a storage system, wherein the second storage tier uses less expensive and/or slower-to-access storage media than the first storage tier. Each instance of the file on the first and second storage tier is associated with a unique program identifier (UPI). A request to access the file or instance thereof is received from a user in a group of users, and a UPI associated with an instance of the file that exists on the first storage tier is searched for. Remote access to the instance of the file on the first storage tier is provided to the user requesting access to the file. Additional embodiments are also presented.

Claims

1. A storage system, comprising:

a first storage tier;

a second storage tier;

a controller configured to;

store instances of a file in the first storage tier and the second storage tier, wherein the second storage tier uses less expensive and/or slower-to-access storage media than the first storage tier;

associate each instance of the file on the first and second storage tier with a unique program identifier (UPI);

receive a request to access the file or instance thereof from a user in a group of users;

search for a UPI associated with an orphaned instance of the file that exists on the first storage tier; and

provide the user requesting access to the file with remote access to the orphaned instance of the file on the first storage tier,

wherein the orphaned instance of the file on the first storage tier was previously disassociated from a second user, and the orphaned instance of the file is identified utilizing a data structure that tracks data ownership of users in the group of users.

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

3. The storage system as recited in claim 1, wherein the controller is configured to provide the user with the remote access to the instance of the file that exists on the first storage tier when the instance of the file is not being used by any other user in the group of users.

4. The storage system as recited in claim 1, wherein the instance of the file that exists on the first storage tier is associated with a second user in the group of users and is not being accessed by the second user, wherein the controller is further configured to:

set an ownership status of the instance of the file on the first storage tier to owned by the user requesting access to the file; and

set an ownership status of an unused instance of the file on the second storage tier from owned by the user requesting access to the file to owned by the second user.

5. The storage system as recited in claim 1, wherein the first 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 UPI is protected by a file system of the storage system such that any manipulation of data in an instance of the file associated with the UPI causes the UPI to be set to a null value or marked as modified.

7. The storage system as recited in claim 1, wherein multiple instances which are associated to a common UPI include a common collection of data.

8. A method, comprising:

storing instances of a file in a first storage tier and a second storage tier of a storage system, wherein the second storage tier uses less expensive and/or slower-to-access storage media than the first storage tier;

associating each instance of the file on the first and second storage tier with a unique program identifier (UPI);

receiving a request to access the file or instance thereof from a user in a group of users;

searching for a UPI associated with an orphaned instance of the file that exists on the first storage tier; and

providing the user requesting access to the file with remote access to the orphaned instance of the file on the first storage tier;

wherein the orphaned instance of the file on the first storage tier was previously disassociated from a second user, and the orphaned instance of the file is identified utilizing a data structure that tracks data ownership of users in the group of users.

9. The method as recited in claim 8, wherein multiple instances which include a common collection of data are associated with a common UPI.

10. The method as recited in claim 8, wherein the file and instances thereof include video data from a broadcast.

11. The method as recited in claim 8, further comprising setting a UPI associated with an instance of the file to null or marked as modified if data in the instance of the file is manipulated in any way.

12. The method as recited in claim 8, further comprising providing the remote access only when the orphaned instance of the file that exists on the first storage tier is not being used by any other user in the group of users.

13. The method as recited in claim 8, wherein the orphaned instance of the file that exists on the first storage tier was previously associated with the second user in the group of users before being disassociated from the second user, and is not being accessed by the second user, and comprising:

searching for the UPI associated with the orphaned instance of the file that exists on the first storage tier based on a determination that the user requesting access to the file is associated with an instance of the file on the second storage tier; and

setting an ownership status of the orphaned instance of the file on the first storage tier to owned by the user requesting access to the file.

14. The method as recited in claim 8, wherein the first storage tier includes at least one random access storage medium, and wherein the second storage tier includes at least one sequential access storage medium.

15. The method as recited in claim 8, wherein the UPI is protected by a file system of the storage system such that any manipulation of data in an instance of the file associated with the UPI causes the UPI to be set to a null value or marked as modified.

16. The method as recited in claim 8, comprising:

associating each user in the group of users with a unique user identifier and storing the association in a first index;

associating each instance of the file on the storage system with a unique user in the group of users via the unique user identifiers and storing the association in a second index; and

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

17. The method as recited in claim 8, wherein any instance of the file is capable of being owned by no more than one user at a time.

18. A computer program product, comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processing circuit to cause the processing circuit to:

store, by the processing circuit, instances of a file in a first storage tier and a second storage tier, wherein the second storage tier uses less expensive and/or slower-to-access storage media than the first storage tier;

associate, by the processing circuit, each instance of the file on the first and second storage tier with a unique program identifier (UPI);

receive, by the processing circuit, a request to access the file or instance thereof from a user in a group of users;

search, by the processing circuit, for a UPI associated with an orphaned instance of the file that exists on the first storage tier; and

provide, by the processing circuit, the user requesting access to the file with remote access to the orphaned instance of the file on the first storage tier,

wherein the orphaned instance of the file on the first storage tier was previously disassociated from a second user, and the orphaned instance of the file is identified utilizing a data structure that tracks data ownership of users in the group of users.

19. The computer program product as recited in claim 18, wherein the UPI is protected by a file system of such that any manipulation of data in an instance of the file associated with the UPI causes the UPI to be set to a null value or marked as modified.

20. The computer program product as recited in claim 18,

wherein the search, by the processing circuit, for the UPI associated with the instance of the file that exists on the first storage tier, comprises a search for a UPI associated with an orphaned instance of the file that exists on the first storage tier;

wherein the remote access provided, by the processing circuit, to the user requesting access to the file, comprises remote access to the orphaned instance of the file on the first storage tier;

wherein multiple instances which are associated to a common UPI include a common collection of data.