As time passes, conditions in your computer system change such
that you will need to manage the DFSMShsm-owned storage media in your
system. For example:
- When the data on backup or ML2 tapes expires, you then want to
consolidate the valid data scattered over many tapes.
- You may expect many data sets to be migrated and want to make
room on the migration volumes for the new data sets before it is done
automatically.
- You may be replacing one DASD device type with another DASD or
tape device type and want to move the data sets that are on level
0, level 1, and level 2 volumes to the new device types.
- You may want to remove volumes from DFSMShsm management or ownership.