When you refer to iSeries™ devices on i5/OS™, you need to use their device description name. When you refer to those devices from an integrated Windows server, you need to use their hardware resource name. If the names are different and you use the wrong name, you get the wrong device.
To determine the hardware resource name and see whether it is the same as the device description name, follow these steps:
Some tape devices report in under more than one device description. Tape libraries (3590, 3570, and so forth) report in as devices (TAPxx) as well as tape libraries (TAPMLBxx), where xx is a number. IBM® Integrated Server Support does not support tape libraries. Therefore, if your device has a tape library description, both the tape device and tape library device must be in a varied off state before locking the device on the Windows server.