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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 proce-
dure 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.
The SCSI Bus Analyzer Task service aid transmits a SCSI inquiry command to a
selectable SCSI address. The service aid then waits for a response. If no response
is received within a defined amount of time, the service aid will display a timeout
message. If an error occurs or a response is received, the service aid will then
display one of the following messages:
The service aid transmitted a SCSI inquiry command and received a valid
response back without any errors being detected.
The service aid transmitted a SCSI inquiry command and did not receive
any response or error status back.
The service aid transmitted a SCSI inquiry command and the adapter
indicated a SCSI bus error.
The service aid transmitted a SCSI inquiry command and an adapter error
occurred.
The service aid transmitted a SCSI inquiry command and a check condition
occur.
When the SCSI Bus Analyzer Task service aid is entered, a description of the
service aid displays.
Pressing the Enter key will display the Adapter Selection menu. This menu allows
the user to enter which address to transmit the SCSI inquiry command.
When the adapter is selected, the SCSI Bus Address Selection menu displays. This
menu allows you to enter which SCSI address to transmit the SCSI inquiry
command.
Once the address is selected, the SCSI Bus Test Run menu displays. This menus
allows the user to transmit the SCSI inquiry command by pressing the Enter key.
The service aid then indicates the status of the transmission. When the transmission
completes, the results of the transmission displays.
7-20 RS/6000 Enterprise Server Model H Series User's Guide