Disk array system and method of renewing data thereof

Details Disk array system and method of renewing data thereof Disk array system and method of renewing data thereof

1993-12-22

1997-04-15

Beausoliel, Jr., Robert W.

G06F 1134

Patent

active

056218826

ABSTRACT:
To a parity group including a plurality of data items and a parity code, at least two dummy data items are added to configure a logical group. The data items, dummy data items, and parity code of each logical group are written in mutually different disk drives. When renewing a data item of a parity group, an old data item and an old parity code are read from the associated drives so as to renew the old data item. According to a new data item for the renewal and the old data item and parity code, there is created a new parity code. The new parity code is written in one of the drives containing dummy data items available at an earliest point of time for the write operation. Prior to the write operation of the new parity code, the new data item is written in a drive containing another dummy data item.

REFERENCES:
patent: 3568153 (1971-03-01), Kurtz et al.
patent: 4761785 (1988-08-01), Clark et al.
patent: 5309451 (1994-05-01), Noya et al.
Patterson, David A., et al. "A Case for Redundant Arrays of Inexpensive Disks (RAID)," ACM SIGMOD Conference, Chicago, Illinois, Jun. 1988, pp. 109-116. (English).

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