Backup directory for a write cache

Details Backup directory for a write cache Backup directory for a write cache

1998-02-03

2000-09-12

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711118, 711156, 711161, G06F 1300

Patent

active

061192090

ABSTRACT:
For error recovery purposes, a backup copy of only a portion of the cache directory is maintained in non-volatile storage. Because only a portion of the cache directory is backup copied, a savings in storage space is realized. The partial copy includes an indication of the storage locations on a storage device for which data is in the cache, and an indication of the state of the data, i.e., whether the data is in process of being read from the cache by the processor, is in process of being written to the cache by the processor, is in the process of being destaged from the cache to the storage device, or none of the above. Only certain changes to the state of the cache cause a backup copy of a portion of the cache directory to be saved; other changes to the state of the cache do not cause the portion of the cache directory to be saved in non-volatile storage. This saves processing time by limiting the number of times that data is copied to the cache.

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