Cache only queue option for cache controller

Details Cache only queue option for cache controller Cache only queue option for cache controller

2006-04-04

2006-04-04

Huynh, Kim (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output data buffering

C710S053000, C710S054000, C710S055000, C710S056000, C710S006000, C710S039000

Reexamination Certificate

active

07024499

ABSTRACT:
A disk input/output (I/O) system includes a controller, a cache, a disk I/O subsystem, and a command queue. The load on the queue is monitored and when it reaches a threshold, commands are designated cache only. Cache only commands are added to the queue only if they can be completed without accessing the disk I/O subsystem. If the disk I/O subsystem would be accessed in order to complete a cache only command, the command is returned to the operating system with an error. The operating system can then add the command to an operating system or back-up queue.

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