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As access to a certain volume is attempted, the Media Database is checked to make sure that the volume is controlled by Control-M/Tape. If the volume does not exist in the Media Database, Control-M/Tape can either add it automatically (by Automatic Check-In), or prompt the operator to determine how to handle the situation (for example, ignore, define, abend).
If the volume is found in the Media Database, Control-M/Tape checks to see if the volume resides in the active library (MAINLIB). If the volume is not listed in the active library (meaning, the volume has an Out Location associated with it, or it is being stored in a local vault), a warning message is issued to the operator. If the volume is assigned to a Remote vault, the operator is given the option to abend the job or let it continue.
Control-M/Tape controls all types of label processing supported by the operating system:
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