CA VM:Backup asks CA VM:Tape for a scratch tape from the resource pool specified in the job template file. When CA VM:Tape provides the tape, CA VM:Backup makes sure the tape is not listed in an existing catalog, then asks CA VM:Tape to mount the tape.
When a backup job ends successfully, CA VM:Backup updates the relevant resource pool with the information concerning the tapes used or added during the job and asks CA VM:Tape to update the TMC with tape information.
If a job is interrupted for any reason, CA VM:Tape reserves the tapes the job has already used so that the job can resume and end successfully. If CA VM:Backup is then started with a cold start and the backup job cannot resume, you might want to expire the tapes manually so that they can be used by another job.
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