UNIT: Specifying the type of device

Explanation: UNIT(unittype) is an optional parameter of PRIMARY and VOLUME specifying the type of unit where the volume being backed up can be allocated.

For unittype, substitute the type of unit where the volume can be allocated.

The following are valid types of DASD units:

3380
3390
9345

Defaults: None.

Note:

You need not specify UNIT if you specify a volume that DFSMShsm manages or owns. If, however, you specify a volume DFSMShsm does not manage, you must also specify the UNIT parameter.
The BACKUPDEVICECATEGORY parameter will override the UNIT parameter when the specified backup device category does not match the specified unit type. For example, if the specified backup device category is DASD and the specified unit type is 3490 (tape) the volumes will be backed up to DASD.
If you specify the UNIT parameter for a volume that DFSMShsm owns or manages, DFSMShsm uses the specified unit type rather than the one in its volume record.