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During the execution of retention management utility CTTRTM, if data set retention is performed according to the retention attributes, the DFSMS Construct Access Services is invoked to obtain the Management Class definition.
DFSMS Management Class definition attributes that are relevant for the Control-M/Tape retention processing are:
The Retention Limit and Expiration attributes are combined with EXPDT/RETPD values (if issued) in the JCL to form a retention criterion. These values are combined in the manner described in "Defining Management Class Attributes" in the DFSMSdfp Storage Administration Reference Manual.
Attribute "# GDG Elements On Primary" specifies the number of data set cycles that Control-M/Tape should retain. If both Expiration Attributes and attribute # GDG Elements On Primary are defined for the same Management Class, a tape data set with this class is expired only if the Management Class attributes, the number of cycles, and JCL EXPDT/RETPD criteria, are satisfied.
The result of merging the retention criteria is referred to as retention attributes, described in the topic Retention Algorithm.
When using Management Class to set a tape data set expiration date, the expiration of the data set is flexible. Each time utility CTTRTM is executed, the Management Class attributes are extracted. Therefore, when changing the Management Class attributes under DFSMS, the expiration date of each data set that has this Management Class in the Control-M/Tape Media Database is also changed.
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