Disk array device and method of updating error correction codes

Details Disk array device and method of updating error correction codes Disk array device and method of updating error correction codes

1994-10-04

1996-12-10

Envall, Jr., Roy N.

Excavating

371 511, 395441, 39549701, G11C 2900

Patent

active

055838766

ABSTRACT:
When new data for writing is sent from a host device, old data and old parities are read after a search time respectively, and a new parity is generated with the new data, the old data and the old parities, and the new parity is stored in a cache memory, and when the number of the new parities corresponding to a plurality of write data becomes more than a predetermined value set by a user or when there is a period of time in which no read request or no write request is issued, new parities are collectively written to a drive for storing parities. In this case, a plurality of new parities are written in a series of storing positions, where a plurality of old parities are stored, in a predetermined access order independent of the stored positions of corresponding old parities. At least to a plurality of storing positions in a track, these new parities are written in the order of positions in a track. To the storing positions which belong to a different track or to a different cylinder, new parities are written in the order of tracks or cylinders.

REFERENCES:
patent: 5416915 (1995-05-01), Mattson et al.
patent: 5418921 (1995-05-01), Cortney et al.
patent: 5418925 (1995-05-01), DeMoss et al.
patent: 5487160 (1996-01-01), Bemis
Ousterhout, J. & Douglas, F. Beating the I-O Bottleneck: Case for Log Structured File Systems. Oct. 1988.
Rosenblum, M. & Ousterhout, J. The Design & Implementation of a Log Structured File System. Feb. 1992.
Stodolsky, D. et al. Parity Logging Overcoming the Small Write Problem in Redundant Disk Arrays. May 1993.
Ousterhout, J. & Douglas, F. Log Structured File Systems IEEE Publication; CH2686-4/89/0000/0124.

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