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Asynchronous Allocation Requests

IP.com Disclosure Number: IPCOM000044942D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06

Publishing Venue

IBM

Related People

Authors:
Duvall, KE Fisher, DT [+details]

Abstract

In a data library subsystem environment having a large number of data storage volumes, the hosts in a multihost environment sharing the mass storage system can asynchronously or synchronously select a given volume for space allocation. During preallocation screening, the selected volume may appear to have sufficient contiguous space to all of the host processes which will or may request allocation space from that volume. When a particular host has selected a volume for allocation, the volume identification is put in an allocation queue for an allocating space manager, such as DASDSM (Direct-Access Storage Device Space Manager), to allocate space for the request. During the queue waiting time, another host may in fact allocate space on the selected volume.