Method and apparatus for providing distributed sparing with unif

Details Method and apparatus for providing distributed sparing with unif Method and apparatus for providing distributed sparing with unif

1993-12-23

1996-01-16

Beausoliel, Jr., Robert W.

G06F 1120

Patent

active

054855713

ABSTRACT:
Data regions, parity regions, and spare regions in a redundant array of storage units are distributed such that each storage unit in the array has the same number of parity regions before, during, and after a failure of one or more storage units such that there is a uniform workload distribution among the storage units during normal operation, during the rebuild process, and during operation after the rebuild and before repair or replacement of the failed unit. The array provides uniform workload distribution for one or more failures of storage units. The number of storage units and the number of storage regions per storage unit is specified once the number of regions in a parity group and the number of failures to be managed are specified. The data regions, parity regions, and spare regions are then placed to provide the uniform workload distribution. Data, parity, and spare regions also can be distributed across multiple redundant arrays to provide the failure-tolerant advantages with uniform workload distribution.

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