This command starts a subtask to Externalize Virtual Volumes for a specific group and subgroup. If the subgroup is currently held, the task terminates without performing any work. In this case, issue the SVTn SET BACKSTORE=RELEASE console command first for the desired subgroup.
This command would normally be used instead of the CHECK BACKSTORE. The difference between the two commands is that CHECK BACKSTORE browses the Local VCAT in ascending group ID order searching for the first group with Virtual Volumes queued for Externalization, and the SVTn START GROUP command starts the specified group or subgroup immediately.
SVTn START Group=nn,SubGroup={Short|Medium|Long}
Where nn is a valid group number.
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