Using ISMF, you can specify the CA reclaim attribute for each data class. This attribute is copied to a data set's catalog entry when the data set is defined. The default value for the attribute is to enable CA reclaim.

As with other data class attributes, CA Reclaim is set at the time the data set is defined. If you later change the value of the CA reclaim attribute for the data class, the change does not affect data sets that have already been defined. The new value is used for any data sets that are subsequently defined with that data class.

The CA reclaim attribute for the data class is always saved, but is used only if CA reclaim is enabled in the IGDSMSxx member of PARMLIB or with the SETSMS command.

For more information, see the topic about defining a data class in z/OS DFSMSdfp Storage Administration.