Peripheral System Pausing and Resuming
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
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.