Method and means for managing DASD array accesses when operating

Details Method and means for managing DASD array accesses when operating Method and means for managing DASD array accesses when operating

1990-08-03

1993-11-23

Beausoliel, Jr., Robert W.

Excavating

395725, 395425, 371401, 371 102, G06F 1100

Patent

active

052650987

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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Brady et al., USSN 07/528,999, filed May 24, 1990, "Method and Means for Accessing DASD Arrays with Tuned Data Transfer Rate and Concurrency".
Patterson et al., "A Case of Redundant Arrays of Inexpensive Disks (RAID) ACM SIGMOD " conference, Chicago, Ill., Jun. 1-3, 1988.
Raghavarao, "Construction and Combinatioial Problems in the Design of Experiments", copyright Dover publication 1971,1988.
Berman and Fryer, "Introduction to Combinatories", copyright Academic Press Inc. 1972.

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