When Virtual Volumes are Externalized and Recycled, they are cataloged with a CA Vtape generated name. Technicians or auditors not familiar with CA Vtape are not going to know about the generated name and are not going to be able to track the application data set to the Virtual Volume and then to the Backstore Tape without your help.
When the Interface is activated on a system with CA 1 or CA TLMS installed, Externalization and Recycle will call the interface as each Virtual Volume is Externalized or Recycled. The call will cause CA 1 or CA TLMS to update the ACTVOL field of their volume record with the VOLSER of the Backstore Tape just used.
Having the stacking location recorded in the Tape Management System Virtual Volume record allows anyone using an application data set name query to find the real location of that data set. This information is especially useful in vaulting procedures, auditing vaulting procedures, and disaster recovery scenarios.
By default the update is done with the DUPLEX Backstore Tape VOLSER. If the stacking group assigned to the Virtual Volume does not have duplexing turned on, the update is done with the PRIMARY Backstore Tape VOLSER.
You can use the parmlib Group Definitions attribute TMSVirtualToPhysicalReport to modify the default.
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