Redundancy accumulator for disk drive array memory

Details Redundancy accumulator for disk drive array memory Redundancy accumulator for disk drive array memory

1990-11-26

1992-09-08

Smith, Jerry

Excavating

371 101, 371 371, 371 491, G06F 1108

Patent

active

051465884

ABSTRACT:
The data storage subsystem of the present invention uses a large plurality of small form factor disk drives to implement an inexpensive, high performance, high reliability disk drive memory that emulates the format and capability of large form factor disk drives. The data transmitted by the associated computer system is used to generate redundancy information which is written with the data across N+M disk drives in a redundancy group in the data storage subsystem. To clear the redundancy accumulator memory, an associated pointer memory is used to indicate the ones of the redundancy accumulator memory byte positions that were used in the previous redundancy calculation. As data is received from the computer system, the pointer memory is checked to determine whether this next byte position need be reset to erase the previously stored redundancy calculation residue. If not, the data is simply stored therein.

REFERENCES:
patent: 4872106 (1989-10-01), Slater
patent: 5077736 (1991-12-01), Dunphy, Jr. et al.
Chen et al., Two Papers on Raids, Computer Science Division, UC Berkeley Dec. 1988.

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