The Tape Management Catalog (TMC) contains a record for each tape in the tape library. Each time a tape is mounted, CA VM:Tape updates the tape’s record in the TMC. Each record contains a volume serial number (volser) which is a 1- to 6-character string identifying the tape volume. The volser can be an external identification (external label), physically recorded on the tape (internal label), or both. To interface with CA 1, a z/OS tape management system, CA VM:Tape uses shared DASD to dynamically read and update the CA 1 TMC.
The TMC, also referred to as the volume library, supports the CA 1 Release 5.0 or the CA 1 EXTEND TMC format. The TMC contains two kinds of records: volume records and data set records. The volume record contains information about each tape volume managed by CA VM:Tape. The data set records contain information about files on one or more volumes. Use the CA VM:Tape CATALOG command to change information such as expiration dates, volume sequence information, and data set information in both kinds of records.
The TMC allows you to specify exact expiration dates and retention periods up to December 31, 2155. All special tape handling, such as marking a tape for cycle control, is performed using keywords. For more information about specifying expiration dates and keywords, see the Command Reference Guide.
The length of a TMC record is 340 bytes, and an Audit record is 370 bytes. The size of the user accounting area (ACCT field) in the volume record is 50 bytes.
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