System and method for ordering commands in an automatic volume p

Details System and method for ordering commands in an automatic volume p System and method for ordering commands in an automatic volume p

1992-04-20

1995-05-23

Bowler, Alyssa H.

Boots, shoes, and leggings

395425, 395275, 3642804, 3642805, 364DIG1, 360 92, G06F 1200

Patent

active

054189713

ABSTRACT:
A system and method of sequencing commands for operation of a volume positioning mechanism in an automated library is taught. The automated library has a plurality of volumes, a plurality of racks for storing the plurality of volumes and at least a first drive unit for recording data to or reading data from a volume mounted thereon by the volume positioning mechanism. Exogenous requests for data stored to the volumes or for storing data to volumes are received from time to time by the library. Each exogenous request for data in a volume is utilized to generate at least a first command for execution by the volume positioning mechanism. Commands as generated are stored in a command queue having a queue input level, a queue output level for the next scheduled command for execution and allowing a plurality of intervening levels. With each introduction of a new command to the command queue, the command queue is reordered with a goal of improving time to dispatch for execution of high priority commands.

REFERENCES:
patent: 3623006 (1971-11-01), Balakian
patent: 4228500 (1980-10-01), Webster
patent: 4656582 (1987-04-01), Chaitin et al.
patent: 4763255 (1988-08-01), Hopkins et al.
patent: 4945428 (1990-07-01), Waldo
patent: 5287459 (1994-02-01), Gniewek

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