Intelligent disk array controller

• US 5,210,860 A
• Filed: 07/20/1990
• Issued: 05/11/1993
• Est. Priority Date: 07/20/1990
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Computer Corporation (HP Inc.)
• Inventors: Pfeffer, Scott M., Schultz, Stephen M.
• Primary Examiner(s): Beausoliel, Robert W.
• Assistant Examiner(s): LO, ALLEN
• Application Number:
  US07/556,646
• Time in Patent Office: 1,026 Days
• Field of Search: 364/268.5, 371/21.1, 371/21.2, 371/10.1, 371/40.1, 360/77.04, 369/534, 395/575
• US Class Current: 714/42
• CPC Class Codes: G06F 11/2221 to test input/output devices or peripheral units
• CPC Class Codes: G06F 2211/1088 Scrubbing in RAID systems with parity
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0673 Single storage device
• CPC Class Codes: G11B 19/06 by counting or timing of machine operations

Abstract

A method for performing background disk sector analysis for drives, including drives dedicated to redundancy and/or fault recovery techniques, in an intelligent, microprocessor based disk array. The method directs the microprocessor to wait a specified time and test for disk activity. In the absence of disk activity, the disk controller is directed to generate a read request for a disk memory location within the array. A return code following the array is checked to determine if the read failed, indicating a disk drive media failure. The disk controller is then notified if a failure occurs. The processor again checks for disk array activity and in the absence of activity issues a read request for successive locations within the array, thereby reading all disk memory locations within the array.

Claims

1. For use with a computer system having a fault tolerant, intelligent mass storage disk array subsystem having individual disk and disk array parameters and associated status information for the disk and disk array, a method for performing disk sector analysis for all drives within the disk array, the steps comprising:

(a) initializing a current disk memory location based upon the disk array and disk drive status information and current disk parameters;

(b) determining whether the disk array is in the process of carrying out disk operations, and if carrying out such operations, suspending operation of the method of the present invention for a predetermined period of time and repeating this step (b) until disk operations are not being carried out;

(c) performing a read operation on the current disk memory location;

(d) checking the results of the read operation to determine if the read operation has failed and upon detection of a failure, indicating the disk media failure for the current disk memory location;

(e) incrementing to a successive disk memory location; and

(f) continuously performing steps (b) through (e) for all disk memory locations for all disks located within the disk array.

2. The method of claim 1, wherein the step of initializing disk memory location further includes determining if the computer system has been reset and if having been reset, initializing the current disk memory location to a predetermined disk memory location within the disk array.

3. The method of claim 1 wherein the step of determining if the disk array is active further includes determining if the disk array controller has received but not acted upon a input or output operation request.

4. The method of claim 3, wherein the step of determining whether the disk array is active further includes determining whether the disk on which the current disk memory location is located is currently being regenerated.

5. For use with a computer system having a fault tolerant, intelligent mass storage disk array subsystem, a method for performing disk sector analysis for all drives within the disk array, the steps comprising:

(a) determining disk and disk array parameters and current status information;

(b) initializing a current disk memory location based upon the disk array and disk drive status information and current disk parameters;

(c) determining whether the disk array is in the process of carrying out disk operations, and if carrying out such operations, suspending operation of the method of the present invention for a predetermined period of time and repeating these steps until disk operations are not being carried out;

(d) generating a read request for the current disk memory location and queuing the read request for execution by the disk array controller;

(e) checking the results of the read request to determine if the read request has failed and upon detection of a failure, indicating the disk media failure for the current disk memory location;

(f) incrementing to a successive disk memory location; and

(g) continuously performing steps (c) through (f) for all disk memory locations for all disks located within the disk array.

6. The method of claim 5, wherein the step of initializing disk memory location further includes determining if the computer system has been reset and if having been reset, initializing the current disk memory location to a predetermined disk memory location within the disk array.

7. The method of claim 5 wherein the step of determining if the disk array is active further includes determining if the disk array controller has received but not acted upon a input or output operation request.

8. The method of claim 7, wherein the step of determining whether the disk array is active further includes determining whether the disk on which the current disk memory location is located is currently being regenerated.

9. The method of claim 5, wherein the step of determining disk and disk array parameters further includes reading disk and disk array parameter information from a reserved disk memory location of a disk.