Up to 1,000,000 Virtual Volumes can be defined to a single CA Vtape Complex. Each one of these Virtual Volumes must also be defined in scratch status to the Tape Management System. Consult your Tape Management System manuals to determine how to define a tape range for CA Vtape to use.
You should define enough Virtual Volumes to handle the workloads redirected to Virtual Devices. The easiest way to determine this number is to run reports against your Tape Management System to determine the number of tapes currently in use, the number of data sets on those tapes, and how much data is on those tapes.
We recommend that a range of 100,000 VOLSERs be defined at minimum. Since these VOLSERs are just indexes in control data sets, they only increase the size of those control data sets. Having extra VOLSERs available is more desirable than having to take outages to resize control data sets to add VOLSERs as needed.
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