Data storage apparatus having data and parity media

Details Data storage apparatus having data and parity media Data storage apparatus having data and parity media

1997-08-13

1998-07-14

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711111, 711112, 711113, 711136, 711160, 39518204, 39518205, 371 21, 371 102, 371 4015, 371 404, 371 4016, 371 491, 371 511, 369 30, 369 32, 369 34, 369 53, 369 58, 369 60, G06F 1200

Patent

active

057819203

ABSTRACT:
There is provided a disk array apparatus designed to realize high-speed recovery processing in occurrence of an error while preventing a reduction in total storage capacity due to the use of parity disks. A disk with a high access frequency is set in a group constituted by a small number of disks, whereas a disk with a low access frequency is set in a group constituted by a large number of disks. In a group constituted by a small number of disks, since the number of disks used for recovery is small, the disk access frequency in recovery processing becomes low, and high-speed recovery processing can be realized. In a group constituted by a large number of disks, since the ratio of the parity disk capacity to the total capacity is low, a reduction in disk capacity is small.

REFERENCES:
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patent: 5309451 (1994-05-01), Noya et al.
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patent: 5490274 (1996-02-01), Zbikowski et al.
Willick et al., "Disk Cache Replacement Policies for Network fileserves," Jun. 1993, pp. 2-11.
Kouredla et al., "Caching Strategies to Improve Disk System Performance," Mar. 1994, pp. 38-46.

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