Data redundancy methods and apparatus

Details Data redundancy methods and apparatus Data redundancy methods and apparatus

2006-08-15

2006-08-15

Decady, Albert (Department: 2138)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S746000, C714S006130, C711S114000, C719S325000

Reexamination Certificate

active

07093182

ABSTRACT:
Method and apparatus for providing data recovery in a one or multiple disk loss situation in a RAID5 like system. A data storage apparatus has a plurality of n disks storing data comprising a plurality of n data groupings stored across the plurality of n disks. Each one of the n data groupings comprises a data portion and a redundancy portion. The size of the data portion relative to the redundancy portion is as H to Q, where H/Q<(n−m)/m, where m is the maximum number of disks that may be lost at any given time. Advantageously, the n data portions are recoverable from any and all combinations of n-m data grouping(s) on n−m disk(s) when the other m data grouping(s) are unavailable, where 1≦m<n.

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