Patent
1992-11-20
1996-07-30
Elmore, Reba I.
39542111, 395489, 395495, G06F 1300
Patent
active
055420648
ABSTRACT:
When a CPU serving as a higher rank apparatus issues an input command to a secondary storage device having a plurality of disk drives, a predetermined number of disk drives each being less in the number of input/output commands to be processed and having a free capacity are selected from the plurality of disk drives so that identical data are multiply written in the selected disk drives. A data address management table for managing data stored in the respective disk drives, a free area management table for managing free areas in the respective disk drives and a disk drive management table for managing the number of input/output commands to be processed in each of the disk drives are generated in a controller in the secondary storage device. Processors in the controller select a predetermined number of optimum disk drives by referring to these tables in response to the input command given from the CPU.
REFERENCES:
patent: 4995040 (1991-02-01), Best et al.
patent: 5170466 (1992-12-01), Rogan et al.
patent: 5321816 (1994-06-01), Rogan et al.
"Disk Shadowing", Proceedings of the 14th International Conference on Very Large Data Bases, 1988, Bitton et al, pp. 331-338.
"A Case of Inexpensive Disks (RAID)", ACMSIGMOD Conference, 1988, Patterson et al. pp. 1-25.
Kakuta Hitoshi
Takamoto Yoshifumi
Tanaka Atsushi
Elmore Reba I.
Hitachi , Ltd.
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