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Varying Reconnect Times for Establishing Priority of Access to a Disk File

IP.com Disclosure Number: IPCOM000043998D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05

Publishing Venue

IBM

Related People

Authors:
Benhase, MT Christian, JH Reed, DG [+details]

Abstract

Most data storage disks are shared among a plurality of using units or processes within the using units, such as host processors and storage controllers. Each disk file has a minimum reconnect time before which the host processor is notified that access to a requested data storage space is imminent. This reconnect time is a function of the host-to-disk file connection parameters, commonly referred to as "channel reconnect time". Usually a normal or minimum latency time for channel reconnect is provided for maximizing channel utilization to the host processor. By extending the reconnect time, priority of access for various processes can be enhanced, while for other processes, priority of access using the normal time is diminished. A data storage disk rotates in the direction of the arrow about an axis of rotation.