Method and means for distributed sparing in dasd arrays

Details Method and means for distributed sparing in dasd arrays Method and means for distributed sparing in dasd arrays

G - Physics

06

F

G06F 11/10 (2006.01) G06F 11/20 (2006.01) G11B 20/18 (2006.01) G11C 29/00 (2006.01)

Patent

CA 2063897

A method and means in which data and parity blocks forming parity groups together with spare blocks are distributed over array block locations according to at least one combinatorial design, each group having N data and P parity blocks. The combinatorial designs yield uniform or balanced loading thereby minimizing the number of accesses to reconstruct missing data and parity blocks and their copyback into spare block locations, and, minimize the number of accesses to the reconstructed data referenced subsequent to its copyback. Distributions of the spare block capacity of one or two DASDs are shown over single and multiple arrays and shared among multiple arrays. Parity block distribution although ancillary to spare distribution enhances throughput and reduces the number of accesses for rebuild etc.

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