Managing access to spare data storage devices

• US 7,308,600 B2
• Filed: 08/11/2004
• Issued: 12/11/2007
• Est. Priority Date: 08/11/2004
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Dubal, Kamlesh I., Lam, Hin Cheuk
• Primary Examiner(s): Nguyen, Hiep T.
• Application Number:
  US10/916,284
• Publication Number:
  US 20060036903A1
• Time in Patent Office: 1,217 Days
• Field of Search: None
• US Class Current: 714/6.1
• CPC Class Codes: G06F 11/2094 Redundant storage or storage space G06F11/2056 takes precedence

Abstract

A dynamic storage system allows storage servers to access spare data storage devices should an associated data storage device fail or become inaccessible. A sparing server receives requests for spare data storage devices from storage servers and allocates spare data storage devices, establishing and maintaining a communication channel between the storage server and the spare data storage device. Once the associated data storage device is returned to service, the spare data storage device is released by the storage server and returned to a spare storage pool by the sparing server.

Claims

1. A dynamic storage system, comprising:

a first storage server adapted to transmit a request in response to a first data storage device becoming inaccessible;

a spare storage pool containing a spare data storage device; and

a second storage server, configured as a sparing server, adapted to establish and maintain a plurality of communication channels over a plurality of network connections between the spare data storage device and the first storage server in response to said request, the plurality of communication channels providing redundancy in the event of a failure of an individual communication channel.

2. The dynamic storage system of claim 1, wherein the spare data storage device is a hard-disk drive.

3. The dynamic storage system of claim 1, wherein the spare data storage device is a magnetic tape drive.

4. The dynamic storage system of claim 1, wherein the spare data storage device is a magneto-optical drive.

5. The dynamic storage system of claim 1, wherein the storage server is a computing device.

6. The dynamic storage system of claim 1, wherein the sparing server includes a disk controller.

7. The dynamic storage system of claim 1, further including a switch for directing the flow of information between the first storage server and the sparing server.

8. The dynamic storage system of claim 7, wherein the switch includes a network switch, bridge, or token ring device.

9. A method of accessing a spare data storage device, comprising the steps of:

configuring a first storage server as a sparing server;

requesting the sparing server to provide a spare data storage device in response to a first data storage device becoming inaccessible;

allocating the spare data storage device to a second storage server by the sparing server;

notifying the second storage server of the allocated spare data storage device; and

establishing a plurality of communications channels, between the spare data storage device and the second storage server, by the sparing server, wherein the plurality of communication channels provide redundancy in the event of a failure of an individual communication channel.

10. The method of claim 9, further comprising the step of releasing the spare data storage device.

11. The method of claim 10, further comprising the step of returning the spare data storage device to a spare storage pool.

12. The method of claim 10, wherein the individual communication channel is a fiber optic cable.

13. An article of manufacture including a data storage medium, said data storage medium including a set of machine-readable instructions that are executable by a processing device to implement an algorithm, said algorithm comprising the steps of:

configuring a first storage server as a sparing server;

requesting the sparing server to provide a spare data storage device in response to a first data storage device becoming inaccessible;

allocating the spare data storage device to a second storage server by the sparing server;

notifying the second storage server of the allocated spare data storage device; and

establishing a plurality of communications channels, between the spare data storage device and the second storage server, by the sparing server, wherein the plurality of communication channels provide redundancy in the event of a failure of an individual communication channel.

14. The article of manufacture of claim 13, further comprising the step of releasing the spare data storage device.

15. The article of manufacture of claim 14, further comprising the step of returning the spare data storage device to a spare storage pool.

16. The article of manufacture of claim 15, wherein the individual communication channel is a fiber optic cable.