DUMPCLASS(UNIT): Specifying a default tape unit name

Explanation: UNIT is an optional subparameter of DUMPCLASS specifying the default unit name for allocation when no volumes are added to the class and when the class has been selected as the target of a dump copy.

DUMPCLASS(UNIT(unittype)): For unittype, substitute a valid esoteric name or a valid unit type.

The following are valid types of tape units:

3480
3480X
3490
3590-1

You can substitute an esoteric tape unit defined with the SETSYS USERUNITTABLE command. If you specify an esoteric tape unit name that does not exist in the user unit table, the command fails. If you specify:

3480 or 3480X, you use all the functions of the 3480 Magnetic Tape Subsystem.
3490, you use all the functions of the 3490 Magnetic Tape Subsystem.
3590-1, you use all the functions of the 3590 Magnetic Tape Subsystem.

If you define both 3592-E05 and 3592-J1A to the same esoteric group, the E05 must use the EFMT1 recording format.

You can define a 3592-E05 or 3592-J1A to the 3590-1 generic group. If so, you must ensure drive compatibility or segregation when using the 3590-1 in a non-SMS environment.

Defaults: If you do not specify UNIT when you define a dump class for the first time, the unit type specified with the SETSYS UNITNAME parameter is the default.

If a dump class is already defined and certain characteristics are being changed, and if UNIT is not specified, the previous specification remains unchanged.

Attention: If UNIT is not specified on either the DEFINE or the SETSYS command, the default unit name that is used for allocation is a 3590-1 unit type.