Data redundancy methods and apparatus
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United States of America Patent
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Aug 15, 2006
Grant Date -
Oct 16, 2003
app pub date -
Feb 20, 2003
filing date -
Aug 2, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
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.ltoreq.m
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