With AIVS processing, CA 1 can track foreign and duplicate volumes. Foreign volumes are created outside of CA 1 control, while duplicate volumes have volume serial numbers which conflict with those already defined to CA 1. Therefore, duplicate volumes have been created on another CA 1 system that is merging its TMC with an existing TMC.
AIVS support is provided in CA 1 by recording the internal or actual volume serial number (ACTVOL) from the tape header. When an AIVS tape is to be opened for input processing, the JCL VOL=SER= parameter or system catalog entry for the file must refer to the external volume serial number. The mount message issued contains both the external and actual volume serial number obtained from the TMC volume record.
It is important to understand that AIVS tape support is read-only. It is intended to allow foreign and duplicate volumes to be used and tracked by CA 1 without requiring that they be copied over to a CA 1 controlled volume. If an AIVS tape is to be reused, it must be initialized with an actual volume serial number equal to the external volume serial number.
AIVS tapes are defined to CA 1 either by directly entering the foreign tape information through a new ISPF facility or by executing the TMSMERGE utility to merge another TMC with duplicate volume serial numbers.
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