System for scheduling readahead operations if new request is wit

Details System for scheduling readahead operations if new request is wit System for scheduling readahead operations if new request is wit

1991-12-17

1996-01-09

Lee, Thomas C.

Boots, shoes, and leggings

395438, 3642451, 3642452, 364245DIG.1, G06F 1314

Patent

active

054836417

ABSTRACT:
An improved read ahead strategy that improves the performance of a disk array subsystem. The disk controller keeps track of the last n reads to the array. If a new read request is received that is adjacent to any of the last n reads, the controller performs a look ahead read because a sequential read may be in progress. The parameter n is preferably set comparable to or greater than the number of maximum independent activites being performed by the computer system. Therefore, in a multithread system, the controller performs a readahead if any one thread is doing a sequential read.

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