Some autoloaders, in particular HP models, can cheat the operating system by allowing communication with the changer on the same SCSI ID and LUN as communication to the tape drive. HP's mtx is an example of a program that can do this. This discussion is on how to do changers properly per spec so that any application can access them. The SCO juke command and the Microlite edge.changer command are two examples of standard programs. There are two standard ways to set up an autochanger device.
Larger changers are really boxes with one or more tape drives installed.
It is important to remember that SCO disables LUN scanning by default in many host adapter drivers. Although you may link in a changer with no complaints using mkdev juke, the host adapter will not pass commands except through LUN 0. Choose the hardware , SCSI ID and LUN as appropriate, and relink the kernel. OSR5 Juke commands Juke commands at a glance. There is one Medium Transport Element.