ALTERNATEUNITNAME: Specifying an alternate unit name for a tape replacement

Explanation: ALTERNATEUNITNAME (unittype) is used to specify the unit name associated with 3480, 3480X or 3490 cartridge-type single-file tape. When ALTERNATEUNITNAME is specified, the tape unit name will be changed in the OCDS TTOC. This will be done as long as there is no incompatibility in the unit name.

Defaults: None.

Note:

The following table shows the compatibility between original volume unit names and alternate volume unit names.

Original Volume Unit Name

Alternate Volume Unit Name

3480

SETSYS NOTAPEHWC 3480X

SETSYS TAPEHWC 3480X

3490

3590-1

3480

3480X
(non-IDRC)

3480X
(IDRC)

3490

3590-1

Note: C = Compatiable I = Incompatiable

The 3480, 3480X, and 3490 can be considered valid generic unit names for the ALTERNATEUNITNAME parameter.
If DISASTERALTERNATEVOLUMES is also specified, then the ALTERNATEUNITNAME will only be used with the DAVOLUMES while in DISASTERMODE. The ALTERNATEUNITNAME does not permanently replace the original unit. The LIST TTOC command will still show the original unit.
When the time comes to permanently replace the original volumes with the alternate volumes, and you issue a TAPEREPL command without DAVOLUMES, the ALTERNATEUNITNAME must be specified again or the original unit name will be used. The original unit name is used if ALTERNATEUNITNAME is not specified on the command.