Management method for spare disk drives in a raid system

• US 7,533,292 B2
• Filed: 07/15/2004
• Issued: 05/12/2009
• Est. Priority Date: 07/15/2004
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Kraemer, Brian C., Van Gundy, Steven R., Benhase, Michael T., Ripberger, Richard A.
• Primary Examiner(s): Beausoliel; Robert
• Assistant Examiner(s): Mehrmanesh; Elmira
• Application Number:
  US10/891,743
• Publication Number:
  US 20060015771A1
• Time in Patent Office: 1,762 Days
• Field of Search: 714/7
• US Class Current: 714/6.32
• 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
• CPC Class Codes: G06F 2201/81 Threshold

Abstract

A RAID system employs a storage controller, a primary storage array having a plurality of primary storage units, and a spare storage pool having one or more spare storage units. A method of operating the storage controller in managing the primary storage array and the spare storage pool involves a testing by the storage controller of at least one repair service threshold representative of one or more operational conditions indicative of a necessity to repair at least one of the primary storage array and the spare storage unit, and a selective initiation by the storage controller of a repair service action for repairing one of the primary storage array and the spare storage unit based on the testing of the at least one repair service threshold.

Claims

1. A method of operating a storage controller for managing a Storage system including a primary storage array having a plurality of primary storage units and a spare storage pool having at least one spare storage unit, the method comprising:

operating the storage controller to detect any failure in a primary storage unit within the primary storage array;

operating the storage controller to migrate data from the primary storage array to the spare storage pool in response to a detection of a failure in the primary storage unit within the primary storage array;

operating the storage controller to test at least one repair service threshold in response to the detection of the failure in a storage unit within the primary storage array, the repair service threshold representative of at least one operational condition indicative of a necessity to repair at least one of the primary storage array and the spare storage unit; and

operating the storage controller to selectively initiate a repair service action for repairing one of the primary storage array and the spare storage unit based on the testing of the at least one repair service threshold.

2. The method of claim 1, wherein the at least one repair service threshold is derived from at least one of a comparison of one or more operational characteristics of the primary storage array and the spare storage pool, an operational status of the primary storage array, and an operational status of the spare storage pool.

3. The method of claim 1, further comprising:

operating the storage controller to test at least one copy back threshold representative of at least one operational condition indicative of a necessity to copy back data migrated from the primary storage away to the spare storage unit in response to the storage controller selecting to initiate a repair service action based on the testing of the at least one repair service threshold; and

operating the storage controller to selectively establishing a requirement to copy back the data based on the testing of the at least one copy back threshold.

4. The method of claim 3, wherein the at least one copy back threshold is derived from at least one of a comparison of one or more operational characteristics of the primary storage array and the spare storage pool, an operational status of the primary storage array, and an operational status of the spare storage pool.

5. The method of claim 1 wherein the repair service threshold is selected from the group consisting of revolutions per minute of spare storage unit compared to the revolutions per minute of the primary storage unit, the interface data rate of the spare storage unit compared to the primary storage unit, whether the spare storage unit and primary storage unit are a mirrored pair on the same device interface, the number of spare storage units with a storage capacity equal to or greater than a storage capacity of the primary storage units, the number of spare storage units attached to the same interface, and a repair action required for a non-failure condition of at least one primary storage unit and at least one inoperative spare storage unit.

6. A computer readable storage medium tangibly embodying a program of machine-readable instructions executable by a processor to perform operations to operate a storage controller in managing a Storage system including a primary storage array having a plurality of primary storage units and a spare storage pool having at least one spare storage unit, the operations comprising:

operating the storage controller to detect any failure in a primary storage unit within the primary storage array;

operating the storage controller to migrate data from the primary storage away to the spare storage pool in response to a detection of a failure in the primary storage unit within the primary storage array;

operating the storage controller to test at least one repair service threshold in response to the detection of the failure in a storage unit within the primary storage array, the repair service threshold representative of at least one operational condition indicative of a necessity to repair at least one of the primary storage array and the spare storage unit; and

operating the storage controller to selectively initiate a repair service action for repairing one of the primary storage away and the spare storage unit based on the testing of the at least one repair service threshold.

7. The computer readable storage medium of claim 6, wherein the at least one repair service threshold is derived from at least one of a comparison of one or more operational characteristics of the primary storage away and the spare storage pool, an operational status of the primary storage array, and an operational status of the spare storage pool.

8. The computer readable storage medium of claim 6, wherein the operations further comprise:

operating the storage controller to test at least one copy back threshold representative of at least one operational condition indicative of a necessity to copy back data migrated from the primary storage away to the spare storage unit in response to the storage controller selecting to initiate a repair service action based on the testing of the at least one repair service threshold; and

operating the storage controller to selectively establishing a requirement to copy back the data based on the testing of the at least one copy back threshold.

9. The computer readable storage medium of claim 8, wherein the at least one copy back threshold is derived from at least one of a comparison of one or more operational characteristics of the primary storage away and the spare storage pool, an operational status of the primary storage array, and an operational status of the spare storage pool.

10. A storage controller, comprising:

a processor; and

memory storing instructions operable with the processor for operating the storage controller in managing a Storage system including a primary storage away having a plurality of primary storage units and a spare storage pool having at least one spare storage unit, the instructions being executed for;

operating the storage controller to detect any failure in a primary storage unit within the primary storage array;

operating the storage controller to migrate data from the primary storage array to the spare storage pool in response to a detection of a failure in the primary storage unit within the primary storage array;

operating the storage controller to test at least one repair service threshold in response to the detection of the failure in a storage unit within the primary storage array, the repair service threshold representative of at least one operational condition indicative of a necessity to repair at least one of the primary storage array and the spare storage unit;

operating the storage controller to selectively initiate a repair service action for repairing one of the primary storage array and the spare storage unit based on the testing of the at least one repair service threshold

operating the storage controller to test at least one copy back threshold representative of at least one operational condition indicative of a necessity to copy back data migrated from the primary storage array to the spare storage unit in response to the storage controller selecting to initiate a repair service action based on the testing of the at least one repair service threshold; and

operating the storage controller to selectively establishing a requirement to copy back the data based on the testing of the at least one copy back threshold.

11. The storage controller of claim 10, wherein the at least one repair service threshold is derived from at least one of a comparison of one or more operational characteristics of the primary storage array and the spare storage pool, an operational status of the primary storage array, and an operational status of the spare storage pool.

12. The storage controller of claim 11, wherein the at least one copy back threshold is derived from at least one of a comparison of one or more operational characteristics of the primary storage array and the spare storage pool, an operational status of the primary storage array, and an operational status of the spare storage pool.

13. A storage system, comprising:

a primary storage away including a plurality of primary storage units;

a spare storage pool including at least one spare storage unit; and

a storage controller interfaced with the primary storage array and the spare storage pool,

wherein the storage controller is operable to;

detect any failure within the primary storage array;

migrate data from the primary storage array to the spare storage pool in response to a detection of a failure within the primary storage array;

test at least one repair service threshold in response to the detection of the failure in a storage unit within the primary storage array, the repair service threshold representative of at least one operational condition indicative of a necessity to repair at least one of the primary storage array and the spare storage unit;

selectively initiate a repair service action for repairing one of the primary storage array and the spare storage unit based on the testing of the at least one repair service threshold

test at least one copy back threshold representative of at least one operational condition indicative of a necessity to copy back data migrated from the primary storage array to the spare storage unit in response to the storage controller selecting to initiate a repair service action based on the testing of the at least one repair service threshold; and

selectively establishing a requirement to copy back the data based on the testing of the at least one copy back threshold.

14. The storage system of claim 13, wherein the at least one repair service threshold is derived from at least one of a comparison of one or more operational characteristic of the primary storage array and the spare storage pool, an operational status of the primary storage array, and an operational status of the spare storage pool.

15. The storage system of claim 13, wherein the at least one copy back threshold is derived from at least one of a comparison of one or more operational characteristic of the primary storage away and the spare storage pool, an operational status of the primary storage array, and an operational status of the spare storage pool.