IBM F50 RS/6000 7025 - Manual (Page 290)

SCSI Bus Analyzer Task
This service aid provides a means to diagnose a SCSI Bus problem in a free-lance
mode.
To use this service aid, the user should have an understanding of how a SCSI Bus
works. This service aid should be used when the diagnostics cannot communicate
with anything on the SCSI Bus and cannot isolate the problem. Normally the
procedure for finding a problem on the SCSI Bus with this service aid is to start with
a single device attached, ensure that it is working, then start adding additional
devices and cables to the bus ensuring that each one works. This service aid will
work with any valid SCSI Bus configuration.
7-20 IBM RS/6000 7025 F50 Series User's Guide