Note: If all systems sharing the TMC are at r11.5 or higher and have had the TMSOSCAT utility run with a PARM=SYNC, this utility is no longer needed. Change the system option OCTLG to NO (default is YES) and reinitialize the CA 1 options. TMSCLEAN processes all Catalog Control files once OCTLG has been changed to NO.
Catalog Control is one of the most effective ways to retain tapes under CA 1. TMSCTLG reads the TMC for volumes under Catalog Control (CATLG or CATALOG in control statements and online interfaces, or LABEL=EXPDT=99000 or ACCODE=xCACATLG in JCL). TMSCTLG queries the system catalog to see if the data set name still has a corresponding entry.
If no entry for the first file is found, TMSCTLG queries each DSNB associated with secondary files on the volume. If a DSNB using Catalog Control still has an entry for the DSN in the system catalog, Catalog Control is still used for the volume set. Otherwise, TMSCTLG resets the expiration date to one of the following:
TMSCTLG updates the X'08' bit in FLAG2 of the volume record or the X'20' bit in FLAG1 of the DSNB record to indicate the data set has been expired from Catalog Control. Once expired, volumes are eligible for scratch processing with the next execution of TMSCLEAN. Execute TMSCTLG before TMSCLEAN to determine the scratch eligibility of tapes under Catalog Control. A RESETCAT parm is provided with TMSCLEAN to update all TMC records with the expired from Catalog Control bit on by turning this bit off and changing the expiration date back to CATALOG before scratching the tapes. This is used in cases, where system failures have resulted in lost catalogs, missing catalog lists, or some other problem that caused more than the correct number of volumes to be expired.
Note: For more information about TMSCTLG, see the Utilities and Reports Reference Guide.
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