Recovery from errors in a redundant array of disk drives

Details Recovery from errors in a redundant array of disk drives Recovery from errors in a redundant array of disk drives

1991-06-18

1994-01-11

Canney, Vincent P.

Excavating

371 111, G06F 1120

Patent

active

052788385

ABSTRACT:
Fault tolerance in a redundant array of disk drives is degraded when error conditions exist in the array. Several methods for rebuilding data of the array to remove the degradation are described. Data rebuilding for entire disk drives and partial data rebuilds of disk drives are described. All rebuild methods tend to reduce the negative affect of using array resources for the data rebuild. In one method rebuilding occurs during idle time of the array. In a second method rebuilding is interleaved between current data area accessing operations of the array at a rate which is inversely proportional to activity level of the array. In a third method, the data are rebuilt when a data area being accessed is a data area needing rebuilding.

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patent: 5208813 (1993-05-01), Stallmo
Patterson et al "A Case for Redundant Arrays of Inexpensive Disks(RAID)" ACM 1988 Mar. 1988 pp. 109-116.

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