APPARATUS, SYSTEM, AND METHOD FOR IMPROVING SYSTEM RELIABILITY BY MANAGING SWITCHED DRIVE NETWORKS

• US 20090125754A1
• Filed: 11/08/2007
• Published: 05/14/2009
• Est. Priority Date: 11/08/2007
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Leskovec, David Lawrence, Chandra, Rashmi, Jishi, Roah, Roskow, Marc Thadeus, Mai Nguyen, Tram Thi, Kahler, David Ray, Van Gundy, Steven Richard
• Application Number:
  US11/937,404
• Publication Number:
  US 20090125754A1
• Time in Patent Office: Days
• US Class Current: 714/7
• CPC Class Codes: G06F 11/1662 the resynchronized component or unit being a persistent storage device re-synchronization of failed mirror storage G06F11/2082; rebuild or reconstruction of parity RAID storage G06F11/1008
• CPC Class Codes: G06F 11/2094 Redundant storage or storage space G06F11/2056 takes precedence

Abstract

An apparatus, system, and method are disclosed for improving system reliability by managing switched drive networks. An off-network pool of storage devices is logically isolated from an array of storage devices. A detection module detects a failed storage device. A repositioning module logically repositions storage devices that are not performing operations. A rebuilding module may rebuild data from the failed storage device.

Claims

1. An apparatus for improving storage system reliability by managing switched drive:

networks, the apparatus comprising;

an off-network pool of storage devices that is configured to be logically isolated from an array of storage devices;

a detection module comprising a computer readable program stored on a tangible storage device executing on a controller and configured to detect a failed storage device in the array of storage devices; and

a repositioning module comprising a computer readable program stored on a tangible storage device executing on a controller and configured to logically reposition the failed storage device from the array, if a remedial operation is not in progress, to the off-network pool wherein the failed storage device is not accessible to the array and data of the failed storage device is accessible to the controller; and

logically reposition a replacement storage device from the off-network pool to the array.

2. The apparatus of claim 1, further comprising a rebuilding module comprising a computer readable program stored on the tangible storage device, executing on the controller, and configured to rebuild the data from the failed storage device wherein the controller initiates rewriting the data to the replacement storage device.

3. The apparatus of claim 1, wherein the off-network pool of storage devices is initially installed, configured, tested, and logically off the network from the storage system.

4. The apparatus of claim 3, wherein the operable off-network pool storage devices can be logically repositioned as a capacity upgrade of the storage system.

5. The apparatus of claim 3, wherein the off-network array of storage devices may be controlled by an independent off-network controller that performs diagnostic tests on the off-network array of storage devices.

6. The apparatus of claim 3, wherein the purpose of storage devices can be modified.

7. The apparatus of claim 1, wherein the detection module is further configured to detect failing storage devices

8. The apparatus of claim 7, wherein the detection module is further configured to:

report an error of a storage device;

determine if a repair to the storage device is in progress;

determine if software for the storage device is updating;

determine if the storage device failed;

determine if the storage device is formatting;

determine if the storage device is certifying; and

determine if the array is rebuilding.

9. The apparatus of claim 1, wherein the repositioning module is further configured to:

determine if failing the storage device is allowed;

determine if the storage device is allowed to be off network;

determine if the failing storage device can be removed without impact to clients of the storage subsystem.

10. The apparatus of claim 1, wherein if the failing storage device cannot be removed successfully, the repositioning module is further configured to determine if a failing operation results in a concurrent operation.

11. The apparatus of claim 1, wherein the failing storage device is logically moved to a logically fenced area for failing storage devices.

12. The apparatus of claim 2, wherein the rebuilding module is further configured to rebuild data from the failing storage devices using the off-network controller.

13. A computer program product comprising a computer useable medium having a computer readable program, wherein the computer readable program when executed on a computer causes the computer to:

detect a failed storage device in an array of storage devices; and

reposition the failed storage device from the array, if a remedial operation is not in progress, to a logically fenced area for failed storage devices in an off-network pool of storage devices that is configured to be logically isolated from the array of storage devices, wherein the failed storage device is not accessible to the array and data of the failed storage device is accessible to the controller; and

logically reposition a replacement storage device from the off-network pool to the array.

rebuild the data from the failed storage device wherein the controller initiates rewriting the data to the replacement storage device.

14. The computer program product of claim 13, wherein the computer readable program is further configured to cause the computer to:

report an error of a storage device;

determine if a repair to the storage device is in progress;

determine if software for the storage device is updating;

determine if the storage device failed;

determine if the storage device is formatting;

determine if the storage device is certifying; and

determine if the array is rebuilding.

15. The computer program product of claim 14, wherein the computer readable program is further configured to cause the computer to:

determine if failing the storage device is allowed; and

determine if the storage device is allowed to be off-network.

16. A system for improving system reliability by managing switched drive networks, the system comprising:

an off-network pool comprising a plurality of storage devices;

an active pool comprising an array of storage devices and a controller in communication with the off-network pool and the array, the controller comprising

a detection module comprising a computer readable program executing on the controller and configured to detect a failed storage device in the array of storage devices;

a repositioning module comprising a computer readable program executing on the controller and configured to logically reposition the failed storage device from the array, if a remedial operation is not in progress, to the off-network pool wherein the failed storage device is not accessible to the array and the data of the failed storage device is accessible to the controller; and

logically reposition a replacement storage device from the off-network pool to the array; and

a rebuilding module comprising a computer readable program executing on a controller and configured to rebuild the data from the failed storage device wherein the controller initiates rewriting the data to the replacement storage device.

17. The system of claim 16, wherein the off-network pool of storage devices is initially installed, configured, tested and logically bypassed from the system network.

18. The system of claim 16, the detection module is further configured to:

report an error of a storage device;

determine if a repair to the storage device is in progress;

determine if software for the storage system is updating;

determine if the storage device failed;

determine if the storage device is formatting;

determine if the storage device is certifying; and

determine if the array is rebuilding.

19. The system of claim 16, wherein the repositioning module is further configured to:

determine if failing the storage device is allowed; and

determine if the storage device is allowed to be off-network.

20. A method for deploying computer infrastructure, comprising integrating computer readable program into a computing system, wherein the program in combination with the computing system is capable of performing the following:

detecting a failed storage device in an array of storage devices; and

reporting an error of the storage device;

determining if a repair to the storage device is in progress;

determining if software for a storage device is updating;

determining if the storage device failed;

determining if the storage device is formatting;

determining if the storage device is certifying;

determining if the array is rebuilding;

determining if failing a storage device is allowed;

determining if the storage device is allowed to be off network;

repositioning a detected storage device to a logically fenced area for failed storage devices in an off-network pool of storage devices; and

rebuilding the data from the failed storage device wherein the controller initiates rewriting the data to a replacement storage device;