CA Vtape initially writes the Virtual Volumes to DASD. The Virtual Volumes are then stacked by the Backstore Engine onto Backstore Tapes. These Virtual Volumes are cataloged to the Backstore Tapes with a generated data set name of prefix.VVE.Vvolser.PRIMARY / DUPLEX, where prefix is the CA Vtape DSN prefix you defined for CA Vtape use.
Stacked or multiple-file physical tapes are supported in different ways by different tape management systems. The typical method is to use catalog control, which is automatically requested by the Backstore Engine when stacking.
Note: Catalog Control is requested by setting the expiration date in the dynamic allocation to a value of 99000. If your tape management system uses a different value, update the CatalogManagedDate attribute in the Dynamic Options Section of parmlib member VTPARMS with the appropriate date value. Issue the SVTn REFRESH=OPTIONS console command for each CA Vtape Subsystem that should pick up the change. Issue the SVTn Display Parmlib console command to verify that the date has been set correctly.
See the following sections for information about the specific tape management system installed.
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