Browse Prior Art Database

Peripheral System Pausing and Resuming

IP.com Disclosure Number: IPCOM000052795D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Legvold, VL: AUTHOR [+3]

Abstract

Complex peripheral systems have diverse peripheral functions for enhancing connected host operations. A PAUSE command from the primary host activates the peripheral system to pause all of its asynchronous operations for allowing interrogation of its control tables and other control information by the primary host. It also allows the peripheral system to conduct inventory operations to be reported to the primary host. Once the check pointing of tables, control information, or inventory has been completed, the primary host will send a RESUME command, whereupon peripheral operations continue. During the PAUSE state, attempted access by any of the other hosts will result in a control unit busy signal being sent. The peripheral manager of the peripheral system can accept commands only from the primary host.

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Peripheral System Pausing and Resuming

Complex peripheral systems have diverse peripheral functions for enhancing connected host operations. A PAUSE command from the primary host activates the peripheral system to pause all of its asynchronous operations for allowing interrogation of its control tables and other control information by the primary host. It also allows the peripheral system to conduct inventory operations to be reported to the primary host. Once the check pointing of tables, control information, or inventory has been completed, the primary host will send a RESUME command, whereupon peripheral operations continue. During the PAUSE state, attempted access by any of the other hosts will result in a control unit busy signal being sent. The peripheral manager of the peripheral system can accept commands only from the primary host.

A plurality of hosts share a common peripheral system which is capable of extensive asynchronous operations for supporting the host programming. One of the hosts, denoted as the primary host, i.e., it has supervisory control over the peripheral system, communicates with the peripheral system over the interconnection PIO and with the other hosts over HH. The other hosts communicate with the peripheral system over IO. The peripheral system includes a peripheral manager which manages and supervises the asynchronous peripheral functions indicated by the double-headed arrow. A plurality of control units, in addition, are controlled by the peripheral manager and provide for data tra...