A resource pool is a collection of tapes that CA VM:Backup can use during backup job processing. If you do not use CA VM:Tape, all tapes used by CA VM:Backup must belong to resource pools. The CA VM:Backup system administrator must create all resource pools.
The tapes included in a particular resource pool must have the same physical characteristics. As each tape is used, CA VM:Backup automatically continues the backup with the next volume in the pool. When the resource pool is empty (that is, all the volumes defined to it have been used), CA VM:Backup either asks you to provide the volser of an available tape to continue processing or puts the job on hold.
A superpool is a collection of DASDtape resource pools that are referenced and used as if they were a single entity. During a backup, if a DASDtape minidisk that is part of the referenced superpool runs out of space, or if the last volser in a DASDtape resource pool is used, CA VM:Backup uses the next pool defined in the superpool to continue the backup. Only when the final resource pool in the superpool is used does CA VM:Backup either ask you to provide the volser of an available volume or puts the job on hold; the action that CA VM:Backup takes at this point is determined by how the system administrator has configured your system.
The CA VM:Backup-CA VM:Tape interface provides a single point of reference for defining the tapes CA VM:Backup is to use for backup jobs. Although CA VM:Backup continues to manage resource pools for DASDtapes, CA VM:Tape assumes complete control over the maintenance of resource pools for physical media.
Depending on the options specified when the CA VM:Tape resource pools are created, CA VM:Tape either selects the volumes to be used in a backup (AUTOPICK) or the CA VM:Tape operator chooses an available scratch volume. In either case, the volume can be drawn from a named scratch pool or from scratch volumes found in the CA VM:Tape Tape Management Catalog (TMC).
An advantage of using CA VM:Tape is that CA VM:Tape handles all tape selection; you are not asked to provide the volser of an available tape.
CA VM:Backup manages tapes belonging to authorized clients such as CA VM:Archiver in the same manner that it manages tapes for its own backup and restore jobs. For every resource pool defined to the client, a corresponding resource pool must be defined to CA VM:Backup. For more information about defining CA VM:Archiver resource pools, see the CA VM:Archiver System Administrator Guide.
If CA VM:Backup is interfaced with CA VM:Tape, CA VM:Tape manages the tapes for the client.
To protect CA VM:Archiver volumes from being used by CA VM:Backup (or other non-CA VM:Archiver jobs), all CA VM:Archiver tapes have an expiration date of PERM, which means that they never expire, and are owned by the CA VM:Archiver service virtual machine, which means that they cannot be used by CA VM:Backup or any other application.
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