Supervisory control of peripheral subsystems

Details Supervisory control of peripheral subsystems Supervisory control of peripheral subsystems

1980-08-21

1984-09-11

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 1300

Patent

active

044714572

ABSTRACT:
A peripheral subsystem accepts and responds to a plurality of supervisory channel commands which alter the operation of the subsystem; i.e., logically partition, break the logical partition, adjust or amend the logical partition, ignore the logical partition, give operator controls for loading and unloading a record cartridge, suspending multipath reconnection and the like. These supervisory commands can be located anywhere in a I/O chaining sequence. Some of the supervisory commands will result in changes in the subsystem operation for the duration of the instant channel program or CCW chain while others persist for as long as the subsystem is operating or until a subsequent supervisory command overrides the previous supervisory command. One of the supervisory commands can selectively inhibit subsequent supervisory commands only within a given I/O chain. This selective inhibit provides subsystem integrity. At the end of the chain, the inhibition is removed.

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patent: 4396984 (1983-02-01), Videki

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