Method and means for managing RAID 5 DASD arrays having RAID DASD arrays as logical devices thereof
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United States of America Patent
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Apr 5, 1994
Grant Date -
N/A
app pub date -
Jul 3, 1991
filing date -
Jul 3, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus teaching insertion of addressing indirection to form and to access an array hierarchy expressly permitting the concurrency of a high level RAID array, the bandwidth and degraded mode operation sustainable by a lower level RAID array, and after a DASD failure minimum spanning involvement when the array is rebuilding and rewriting missing data to a spare logical device. Also, disclosed are the accessing of variable length records on the array hierarchy; array hierarchy in which RAID 5 arrays have dissimilar number of logic devices (lower level RAID arrays) and interleave depths; formation of logical arrays using fractional storage defined onto real DASD subsets; and the defining of logical devices onto DASDs distributed in the same or different physical clusters of DASDs and the rebuild operation thereof.
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