The VTGROUP parmlib member contains group attribute definitions. These attributes specify characteristics like the esoteric names used to Externalize Virtual Volumes. These options are considered local in scope, unique to the subsystem (unless noted by the attribute description).
While active, the CA Vtape subsystem can dynamically reload the group member attributes by using the SVTn REFRESH=GROUP console command.
Since the group definitions are local definitions that are subsystem-specific, the SVTn REFRESH=GROUP console command must be issued for each CA Vtape subsystem sharing a common group member that has been modified. If this is not done, then only the CA Vtape subsystem for which the command was issued will pick up the changes.
The SVTn REFRESH=GROUP console command should be executed when there are no active Externalization subtasks for the groups being changed. Groups with active Externalization subtasks will not be refreshed and the previous attributes will continue in effect. When changes are needed for the attributes in a group, we recommend that you first hold Externalization for the group, wait for the related Externalization subtasks to complete, and then proceed with refreshing the groups.
Important! If a change is made to the Primary, Duplex, Export, ShortRetention, or MediumRetention attributes, CA Vtape will ignore the last-used physical tape. Scratch tapes will be requested for the first Externalization process after the SVTn REFRESH=GROUP console command is executed or the CA Vtape subsystem is restarted.
VTGROUP contains an index section named Group Definitions, which references one or more group sections with customizable names.
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