First, CA VM:Backup sorts the list of tapes defined to the resource pool specified by the backup job template file by expiration date and volser. It then selects tapes in this order to use in the job.
CA VM:Backup asks the tape operator to mount the first tape. When the tape is mounted, CA VM:Backup checks the label to verify that it is the tape requested. If it is not, CA VM:Backup asks the operator to mount the correct tape.
If no tapes are available for a particular backup, CA VM:Backup might ask the tape operator to provide the volser of a tape to use. When the operator provides a volser, CA VM:Backup makes sure the tape is not listed in an existing catalog.
When a backup job ends successfully, CA VM:Backup updates the relevant resource pool with information concerning the tapes used or added during the job.
If a job is interrupted for any reason, CA VM:Backup 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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