Disk array system having special parity groups for data blocks w

Details Disk array system having special parity groups for data blocks w Disk array system having special parity groups for data blocks w

1994-12-27

1996-02-06

Beausoliel, Jr., Robert W.

G06F 1100

Patent

active

054902487

ABSTRACT:
In a digital storage disk array system in which parity blocks are created and stored in order to be able to recover lost data blocks in the event of failure of a disk, high-activity parity groups are created for data blocks having high write activity and low-activity parity groups are created for data blocks not having high write activity. High-activity parity blocks formed from the high-activity data blocks are then stored in a buffer memory of a controller rather than on the disks in order to reduce the number of disk accesses during updating.

REFERENCES:
patent: 4638425 (1987-01-01), Hartung
patent: 4912712 (1990-03-01), Yamada
patent: 4967414 (1990-10-01), Lusch et al.
patent: 5155835 (1992-10-01), Belsan
patent: 5263145 (1993-11-01), Brady et al.
Menon et al "Methods for Improved Update Performance of Disk Arrays" Proc. of the 25th Hawaii Int. Conf. on System Sciences Jan. 1992 pp. 74-83.
Mourad et al "Database Recovery Using Redundant Disk Arrays" 8th Int. Conf. on Data Eng. pp. 176-183 Feb. 1992.

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