Reuse of problematic disks in a redundant disk system

• US 9,632,871 B2
• Filed: 03/10/2015
• Issued: 04/25/2017
• Est. Priority Date: 04/24/2014
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Zhou, Xue Qiang
• Primary Examiner(s): Riad, Amine
• Application Number:
  US14/642,791
• Publication Number:
  US 20150309876A1
• Time in Patent Office: 777 Days
• Field of Search: 714 622
• CPC Class Codes: G06F 11/1084 Degraded mode, e.g. caused by single or multiple storage removals or disk failures
• CPC Class Codes: G06F 11/1092 Rebuilding, e.g. when physically replacing a failing disk

Abstract

A problematic disk within a Redundant Array of Independent Disks (RAID) data storage system can be reused. A first disk within the RAID data storage system can be formatted, initialized, and validated in response to the first disk experiencing a recoverable data storage error. The first disk can be designated as a second-level redundant disk within the RAID data storage system in order for the RAID data storage system to access the first disk in response to success of the validating operation on the first disk. Problematic disks experiencing media errors and/or slow disk errors can be isolated from the RAID data storage system to ensure high reliability of the RAID system.

Claims

1. A method for reuse of a problematic disk in a Redundant Array of Independent Disks (RAID) system, the method comprising:

performing formatting, initializing and validating operations on a first disk in the RAID system in response to the first disk experiencing a problem and determining that the first disk has not experienced a hard error; and

setting the first disk as a second-level redundant disk in the RAID system in order for the RAID system to use the first disk again in response to success of the validating operation on the first disk.

2. The method of claim 1, further comprising rebuilding, on a first-level redundant disk within the RAID data storage system, data to replace the contents of the first disk.

3. The method of claim 1, wherein setting the first disk as a second-level redundant disk in the RAID system further comprises storing the number of times that the first disk experiences a problem before it is set as the second-level redundant disk.

4. The method of claim 3, wherein using the first disk again further comprises:

comparing, in response to a second disk within the RAID system experiencing a data storage error and the RAID system lacking an available first-level redundant disk, a count of data storage errors experienced by the second disk with a stored count of data storage errors experienced by the second-level redundant disk; and

in response to the count being greater than the stored count, rebuilding on the second-level redundant disk, data to replace the second disk.

5. The method of claim 1, wherein using the first disk again further comprises rebuilding, in response to a second disk experiencing a data storage error and the RAID system lacking an available a first-level redundant disk, on a second-level redundant disk, data to replace the second disk within the RAID system.

6. The method of claim 5, further comprising performing, in response to the second disk within the RAID system experiencing a recoverable data storage error, formatting, initializing and validating operations on the second disk.

7. The method of claim 6, further comprising designating the second disk as a second-level redundant disk within the RAID system;

and

in response to success of the validating operation on the second disk, accessing the second disk.

8. The method of claim 6, further comprising, in response to a failure of the validating operation on the second disk, isolating the second disk from the RAID system.

9. The method of claim 5, further comprising isolating, in response to the second disk experiencing a hard data storage error, the second disk from the RAID system.

10. A system for reuse of a problematic disk within a Redundant Array of Independent Disks (RAID), the system including a non-transitory computer-readable storage medium having program instructions stored thereon, the program instructions executable by one or more computer processor circuits configured to execute a method, the method comprising:

performing formatting, initializing and validating operations on a first disk in the RAID system in response to the first disk experiencing a problem and determining that the first disk has not experienced a hard error; and

setting the first disk as a second-level redundant disk in the RAID system in order for the RAID system to use the first disk again in response to success of the validating operation on the first disk.

11. The system of claim 10, the method further comprising rebuilding, on a first-level redundant disk within the RAID data storage system, data to replace the contents of the first disk.

12. The system of claim 10, wherein setting the first disk as a second-level redundant disk in the RAID system further comprises storing the number of times that the first disk experiences a problem before it is set as the second-level redundant disk.

13. The system of claim 12, wherein using the first disk again further comprises:

comparing, in response to a second disk within the RAID system experiencing a data storage error and the RAID system lacking an available first-level redundant disk, a count of data storage errors experienced by the second disk with a stored count of data storage errors experienced by the second-level redundant disk; and

in response to the count being greater than the stored count, rebuilding on the second-level redundant disk, data to replace the second disk.

14. The system of claim 10, wherein using the first disk again further comprises rebuilding, in response to a second disk experiencing a data storage error and the RAID system lacking an available a first-level redundant disk, on a second-level redundant disk, data to replace the second disk within the RAID system.

15. The system of claim 14, the method further comprising performing, in response to the second disk within the RAID system experiencing a recoverable data storage error, formatting, initializing and validating operations on the second disk.

16. The system of claim 15, the method further comprising

designating the second disk as a second-level redundant disk within the RAID system;

and

in response to success of the validating operation on the second disk, accessing the second disk.

17. The system of claim 15, the method further comprising, in response to a failure of the validating operation on the second disk, isolating the second disk from the RAID system.

18. The system of claim 14, the method further comprising isolating, in response to the second disk experiencing a hard data storage error, the second disk from the RAID system.