The AIVS feature of CA 1 allows volumes created on another CA 1 system or a foreign volume (one not created on a CA 1 system) to retain their original internal volume serial number, while assigning a new external volume serial number which CA 1 uses to track the tape.
When processing an AIVS volume during OPEN for Input, CA 1 checks that the volume serial number on the tape matches the internal volume serial number recorded in the TMC. Verification of the file name will not proceed unless the internal volume serial number on the tape matches that recorded in the TMC.
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