This exit is called during realtime processing (OPEN output) to verify the tape mounted in response to a nonspecific mount request is from the correct CA TLMS scratch tape subpool. It is also called when Realtime Stacking is selecting a volume to have files stacked on.
The CA TLMS WTO SSI may have assigned a scratch subpool name when the original mount message was issued. The WTO SSI uses rules defined in CTOSCRxx and CTONSMxx loaded by TLMSRIM and pattern masking specifications to assign a scratch subpool based on data set name, SMS management class, job name, and unit address. If the original CA TLMS mount message is not modified by WTO user exits, MPF processing, or other means, this exit is not required. If the original CA TLMS mount message is modified, then this exit can be used to verify that the tape mounted is from the correct subpool.
Four exit points are provided in CTSUX1G:
Continue scratch subpool verification, no changes made/volume is eligible for Realtime Stacking.
Continue scratch subpool verification, user exit made changes.
Demount tape with reject code supplied in field AXREJECT.
The tape is not eligible for Realtime Stacking.
This exit is activated by specifying YES or exitname in the SPLEXIT system option.
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