If you specify VOLUME without volser, DFSMShsm lists all volume entries for all the DFSMShsm-managed and migration volumes it owns or manages.

If you do not specify the parameters MIGRATIONVOLUME, PRIMARYVOLUME, VOLUME, BACKUPVOLUME, USER, DATASETNAME, or LEVEL, DFSMShsm lists all the data set entries that have your user identification as the set of initial characters of the data set name.