CA 1 does not allow a volume under Catalog Control (CATLG or CATALOG in control statements and online interfaces, or LABEL=EXPDT=99000 or ACCODE=xCACATLG in JCL) to be scratched as long as an entry on the system catalog matches the data set(s) on the volume. If the system catalog does not have a corresponding entry, the expiration date for the tape volume is reset to the current date plus any catalog extension.
Proper use of Catalog Control can eliminate job abends that may occur when the system catalog and the TMC differ on the content of a volume. If the system catalog indicates that data set ABC is on volume 123456, but the volume actually contains data set XYZ because the volume was scratched earlier and reused under CA 1 control, an abend is likely to occur.
Catalog Control processing is performed by either the batch utility TMSCTLG or by TMSCLEAN.
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