Method and means for reducing device contention by random access

Details Method and means for reducing device contention by random access Method and means for reducing device contention by random access

1997-09-25

2000-08-29

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711112, 711111, 711113, 360 48, G06F 1200

Patent

active

061122777

ABSTRACT:
A staging method and means for both device read and update write operations in which messages and commands between a storage subsystem and a fixed-block formatted RAID array emulating a variable-length record (CKD) formatted device for both read and write operations are evaluated to ascertain whether the record addressing was random and truly in record mode. If they are in that mode, then partial track staging by the RAID array control from the fixed-block formatted HDDs to a subsystem cache or the like would reduce device contention by reading and staging less than full track.

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