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

1994-07-15

1997-07-29

Hindi, Nabil Z.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 58, 369 34, 369 53, G11B 700

Patent

active

056527411

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:
patent: 5121483 (1992-06-01), Monahan et al.
patent: 5148432 (1992-09-01), Gordon et al.
patent: 5459848 (1995-10-01), Mase

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