Patent
1995-12-29
1998-04-21
Decady, Albert
395441, G06F 1100, G06F 1200
Patent
active
057427526
ABSTRACT:
Method for implementing a stripe write operation in a RAID device having XOR command set enabled disk drives on a common interface bus. The method of the present invention improves upon prior designs which do not use the XOR command set by eliminating the need for the RAID controller to include XOR (parity) generation computational elements. Further, the method of the present invention improves upon the stripe write method suggested by the XOR command set specifications in which a stripe is performed by a series of xdwrite XOR command operations issued to the data drives of the RAID array. Rather, the method of the present invention performs parallel standard writes of the data portions of the stripe write, then issues a rebuild XOR command to the parity disk drive to rapidly regenerate the parity blocks in the stripe just written. The method of the present invention reduces the worst case rotational latency delay of the stripe write operation to two rotational latency periods.
REFERENCES:
patent: 5191584 (1993-03-01), Anderson
patent: 5313626 (1994-05-01), Jones et al.
patent: 5315602 (1994-05-01), Noya et al.
patent: 5390187 (1995-02-01), Stallmo
patent: 5506977 (1996-04-01), Jones
patent: 5594862 (1997-01-01), Winkler et al.
Bailey Wayne P.
De'cady Albert
Fishman Daniel N.
Symbios Logic Inc.
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