Original Publication Date: 1983-Oct-01
Included in the Prior Art Database: 2005-Feb-07
Peripheral data storage devices of the cyclical and tape type are shared among a large number of users. A queueing system meshes the user requirements along with tape and cyclical access parameters. The queue has two segments for user priority: a wait priority of the highest type and a non-wait of the lower type. A non-wait portion is FIFO (first-in, first-out with respect to each single user's requests; any user's first request will be handled before another user's second request. Device priorities override the user queueing priorities, such as for tape, based upon the current use of the device being accessed. For example, if a tape volume is mounted and currently being accessed, then all requests for access to such tape volume in the queue, regardless of user priorities, are handled before the tape volume is demounted.