System for automatic buffering of commands for DASD units

Details System for automatic buffering of commands for DASD units System for automatic buffering of commands for DASD units

1996-09-03

1998-08-11

Harrell, Robert B.

39575003, G06F 900, G06F 1300

Patent

active

057940568

ABSTRACT:
A direct access storage device may handle various disk drive management functions without contemporaneous host computer involvement by buffering commands for the management functions in controller memory. The commands may be read into controller memory from the disk drive on power up or programmed by the host computer. Initially the commands are treated as processes in a blocked state. Operating statistics kept by a supervisor program for the controller are monitored by an event handler, which moves processes to a ready to run state upon occurrence of specified conditions. A dispatcher then moves commands into the direct access storage controller for execution and subsequent return to blocked status.

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"Dynamically Maintained Command Chains", IBM Technical Disclosure Bulletin, vol. 24, No. 12, New York, U.S., May, 1992, pp. 6605-6606.

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