Each device on a Fibre Channel loop must have an Arbitrated Loop Physical Address (AL_PA) to communicate. The AL_PA identifies the device on the loop. To set the Ultrium 2 Tape Drive’s AL_PA, you must place jumpers on specific pins in the drive’s loop identifier (LID)/status connector. The placement of the jumpers indicates whether you want to choose the LID yourself (each LID corresponds to a specific AL_PA) or whether you want the drive to choose the AL_PA by arbitrating it with other devices on the loop. Valid LIDs and their corresponding AL_PAs are provided in this section.
Note: A Loop ID is part of a contiguous range of values; valid AL_PA values are not in a contiguous range.
In addition to establishing the AL_PA, by moving Feature Switch 3 on the drive to ON or off you can set the drive so that it provides one of the following functions:
vStatus about the Fibre Channel loop (through the use of external indicators in an enclosure)
vAdditional LIDs
The sections that follow describe how to select the AL_PA. They also describe how to set Feature Switch 3 so that the drive gives status about the loop or provides additional LIDs.
Chapter 3. Installing 19