Method of handling disk sector errors in DASD cache

Details Method of handling disk sector errors in DASD cache Method of handling disk sector errors in DASD cache

1987-03-30

1990-11-20

James, Andrew J.

Boots, shoes, and leggings

364900, G06F 1300, G06F 1120, G06F 900

Patent

active

049723162

ABSTRACT:
In a DASD caching system, in which pages of sectors of data are stored by reading in a desired sector and prefetching a plurality of adjacent sectors for later access, errors in disk storage media cause error signals to be generated. Such errors are handled by storing indications of which sectors have errors and which do not, and accessing such indications in response to later requests for such sectors. Such indications are stored in each page in the cache. Further, a history is maintained of which pages and sectors therein, were placed in the cache in the past.

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