Disk array apparatus that only calculates new parity after a pre

Details Disk array apparatus that only calculates new parity after a pre Disk array apparatus that only calculates new parity after a pre

1998-02-26

1999-09-21

Beausoliel, Jr., Robert W.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

714770, G06F 1100

Patent

active

059548223

ABSTRACT:
A parity which is used to a disk array is formed by using a cache memory. A storing method of the cache memory is classified into three methods such that: only data is stored; only redundant information is stored; and both of the data and the redundant information are stored. Even when a power source is shut off during the data writing process, the processing stages of the data writing and parity updating and the necessary data are stored into a non-volatile memory and are used for recovery.

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