Method and means for managing DASD array accesses when operating in degraded mode
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United States of America Patent
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Nov 23, 1993
Grant Date -
N/A
app pub date -
Aug 3, 1990
filing date -
Aug 3, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus are disclosed which minimize the additional read and write loading for each remaining DASD in a DASD array occasioned by a single point of failure where subsets of DASDs may accessed asynchronously (RAID 4 or RAID 5). In this method, parity groups are written across the array in a pattern forming a balanced incomplete block design or the equivalent. In the event of failure of a DASD in the array, then any additional loading resulting from the failure is uniformly spread among the remaining DASDs.
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