Method and apparatus of controlling a disk cache during a degene

Details Method and apparatus of controlling a disk cache during a degene Method and apparatus of controlling a disk cache during a degene

1997-12-23

2000-08-15

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711113, 714 6, G06F 1216

Patent

active

061051160

ABSTRACT:
A disk cache is controlled to continue duel data writing even during a degenerated mode of operation due to a failure of a cache memory, and also to continue a FAST WRITE process while maintaining reliability for thereby avoiding a drop in performance. If a memory module MM#1 fails, processing of dirty data 111 stored in the memory module MM#1 is continued using backup data 122 stored in a memory module MM#2 for the dirty data 111 stored in the memory module MM#1. The backup data 122 stored in the memory module MM#2 for the dirty data 111 stored in the memory module MM#1 is copied to a memory module MM#3, generating backup data 111' for the dirty data 111. Then, dirty data 131 stored in the memory module MM#3 is copied to the memory module MM#2, generating backup data 112' for the dirty data 131 stored in the memory module MM#3, instead of backup data 112 stored in the memory module MM#1.

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patent: 5548711 (1996-08-01), Brant et al.
patent: 5553263 (1996-09-01), Kalish et al.
patent: 5617530 (1997-04-01), Stallmo et al.
patent: 5689729 (1997-11-01), Inoue

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