If you use DASD ML2 volumes or tape volumes that are set aside
only for DFSMShsm use, you must identify the volumes to DFSMShsm.
The ADDVOL command does this. An example command that could be issued
in at least one DFSMShsm host if you were using DASD ML2 volumes is:
ADDVOL ML2001 UNIT(3390) MIGRATION(MIGRATIONLEVEL2)