When an active Externalization task empties a subgroup queue, the Backstore Engine keeps the physical tape and saves the VOLSER, and the last file sequence number used, and the last Virtual Volser written in the Local VCAT. When additional Virtual Volumes for the same group and subgroup are queued for Externalization, the Backstore Engine will request a tape mount for the saved VOLSER and stack the additional Virtual Volumes on that VOLSER. These actions will be repeated until the tape is full, at which time a scratch mount is requested.
There are times when a tape should not be mounted again for additional Backstore processing. For example, when a tape is known to be damaged or when the tape must be taken off-site.
A console command has been provided to release a tape from additional backstore processing. You can use the SVTn SET BACKstore=EXCLVOL,VOLser= volser console command, where volser is the Backstore Tape VOLSER, to release individual tapes. You can use the SVTn SET BACKstore, EXCLVOL,Group=*,Type=D console command c to release all DUPLEX tapes for all groups for off-site movement.
When Externalization starts again, the saved PRIMARY VOLSERs are remounted for filling and scratch mounts are requested for the DUPLEXes.
Note: For more information about the SVTn SET BACKstore=EXCLVOL command, see the chapter “Console Commands” in the Administration Guide.
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