Method and system for improved buffer utilization for disk...

Details Method and system for improved buffer utilization for disk... Method and system for improved buffer utilization for disk...

2007-10-30

2007-10-30

Torres, Joseph D. (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C711S114000, C719S325000

Reexamination Certificate

active

10994086

ABSTRACT:
During a parity update of a parity stripe in a disk array, constant values used in finite field arithmetic are algebraically combined in order to reduce the number of buffers and steps needed to update multiple parity values when a change in data occurs. In one implementation, for example, the contents of a buffer that stores the product of a delta value associated with the change in data and a first constant, which is used to update a first parity value, are multiplied by a value representative of the ratio of a second constant, which is used to update a second parity value, and the first constant.

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IBM Technical Disclosure Bulletin, vol. 38, No. 07, Jul. 1995, pp. 455-458, “Foreground/Background Checking of Parity in a Redundant Array of Independent Disks-5 Storage Subsystem” by Faunce, M. S. et al.

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