Use the tape allocation user exit, VMBEXIT5, to determine which tape CA VM:Backup should use next in a backup or MPC job. The tape returned by the user exit must already be defined in the resource pool that was specified in the arguments passed to VMBEXIT5.
VMBEXIT5 is not called when the CA VM:Tape interface is in use. VMBEXIT5 is also not called for the first tape when a job submitted by specifies a starting volser.
A sample user exit, VMBEXIT5 XEXEC, is included on the distribution tape. You must rename the user exit to VMBEXIT5 EXEC for CA VM:Backup to use it. CA VM:Backup automatically checks whether a VMBEXIT5 EXEC exists. If it does, CA VM:Backup lets it handle tape selection for all jobs, including those submitted by authorized clients such as CA VM:Archiver.
You can use this exit to dynamically define the order in which volsers are used in a backup or MPC job. Two sample user exits, VMBEXIT1 YEXEC and VMBEXIT5 YEXEC, are provided to accommodate automatic cartridge loaders when the CA VM:Tape interface is not active. These sample user exits are included in the SERVLINK file and are deployed to the CA VM:Backup sample code minidisk during the installation.
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