Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
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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Chen Ying
De'cady Albert
Inostor Corporation
Trimmings John P.
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