Array disk subsystem

Details Array disk subsystem Array disk subsystem

1990-12-19

1995-03-28

Beausoliel, Jr., Robert W.

Excavating

371 81, 3642683, 3642685, G06F 1100, G06F 100, G06F 1300

Patent

active

054024285

ABSTRACT:
An array disk subsystem including a command selector for separating a signal from a host into a data item and a command, a data dividing unit for subdividing the data item, an ECC generator for producing an ECC for each of the obtained subdata items, a group of data disks for respectively storing thereon the subdata items and the ECCs, a command interpreting unit for interpreting the command, an I/O counter for counting I/O commands in the command, a backup processor for requesting a backup command based on count information of the I/O counter, and a backup unit responsive to the backup command for sequentially reading the subdata items and the ECCs from the data disks to record therein the subdata items and the ECCs.

REFERENCES:
patent: 4817035 (1989-03-01), Timsit
patent: 4899342 (1990-02-01), Potter et al.
patent: 4914656 (1990-04-01), Dumphy, Jr. et al.
patent: 4942579 (1990-07-01), Goodlander et al.
patent: 5109505 (1992-04-01), Kihara et al.
"Providing Fault Tolerance in Parallel Secondary Storage Systems", Park et al, Princeton University, Nov. 7, 1986.
"A Case for Redundant Arrays of Inexpensive Disks (RAID)", Patterson et al, University of California.
"Coding Techniques for Handling Failures in Large Disk Arrays", Gibson et al, University of California, Dec., 1988.

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