Disk array device having spare disk drive and data sparing...

Details Disk array device having spare disk drive and data sparing... Disk array device having spare disk drive and data sparing...

2006-11-07

2006-11-07

Shah, Sanjiv (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

Reexamination Certificate

active

07133966

ABSTRACT:
In a disk array of the RAID constitution, a likelihood of occurrence of a failure is predicted from the number of times of error occurrence for each of disk drives #0to #3in a certain parity group. Two storage areas #0_UH and #2_LH of a half size, which are different in data stripes from each other, are selected from two disk drives #0and #2having a relatively high likelihood of occurrence of a failure, respectively, and the data thereof is copied to a spare disk #A (divided data copy). When the likelihood of occurrence of a failure of one disk drive #0further increases, the remaining half storage area #OLH of the disk drive #0is copied to the spare disk #A (dynamic sparing). Dynamic sparing time is reduced and a likelihood of data lost due to a multiple disk failure by employing the divided data copy processing.

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