DFSMSrmm automatically records information about a data set when the data set is opened. DFSMSrmm can automatically record information when you request data set recording and one of these conditions is true:

• The data set is the first file on the volume.
• You already processed all files preceding it on the volume.
• You have previously defined the data sets on the volume to DFSMSrmm.

Data class, management class, storage class, and storage group are included in the information that DFSMSrmm records for system-managed data sets.

When the data set is created on a tape volume managed by the EXPDT retention method, the data set VRSELEXCLUDE attribute is automatically set. If the data set is created on a tape volume managed by the VRSEL retention method, the VRSELEXCLUDE attribute can be set by the EDG_EXIT100 installation exit, and can be set or reset later by command.

You can manually add information about a data set if the volume on which the data set resides is already defined to DFSMSrmm and the volume has not been already processed as a result of open processing and close processing. There are some limitations on the information that you can change if it was originally recorded by DFSMSrmm during open, close, and end-of-volume processing.

DFSMSrmm supports generic data set names as filter criteria for searching the control data set which makes it easier to create lists of resources.