Method and means for fast writing data to LRU cached based DASD

Details Method and means for fast writing data to LRU cached based DASD Method and means for fast writing data to LRU cached based DASD

1992-05-05

1995-05-23

Gossage, Glenn

Boots, shoes, and leggings

36424341, 36422282, 3642566, 364964, 364DIG1, 36496579, 36496434, 3649578, 364DIG2, G06F 1300, G06F 1200, G06F 1208

Patent

active

054189217

ABSTRACT:
A method and means using a fast write in order to eliminate DASD time from the write response time as seen by the host; eliminate some DASD writes due to overwrites caused by later host writes to previously updated blocks in cache; and reduce DASD seeks because destages will be postponed until many destages can be done to a track or cylinder. This is effectuated by destaging from the cache only the least recently referenced original or updated block and all other original or updated blocks occupying the same logical track and ordered in a predefined lower LRU range, the destage being initiated responsive to a cache miss. The destaging step is selectable from a set of destaging steps varying in their robustness.

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