Explanation: AVAILABLE is an optional subparameter
of SELECT specifying a list of each dump volume that is available
for dump output use. An available volume is one that has been added
to DFSMShsm's inventory but never used or that has been used
but has since been invalidated and remains under DFSMShsm ownership.
The following information is listed for each available dump volume:
- Volume serial number
- Unit type
- Dump class
Defaults: None.