DFSMSrmm deletes volume information from the control data set when you release a volume. See Releasing volumes for more information.

You can delete stacked volumes from DFSMSrmm only when they contain no volumes. When stacked volume support is enabled, DFSMSrmm tracks the number of contained volumes. To remove a volume from a stacked volume, use the RMM CHANGEVOLUME subcommand on the contained volume to clear the container name.