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SCSI Bus Analyzer
This service aid allows you to diagnose a SCSI bus problem in a freelance mode.
To use this service aid, the user should understand how a SCSI bus works. Use this
service aid 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 works with any valid SCSI bus configuration.
The SCSI Bus 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 displays a timeout message. If an error occurs
or a response is received, the service aid then displays one of the following messages:
v The service aid transmitted a SCSI Inquiry Command and received a valid
response back without any errors being detected.
v The service aid transmitted a SCSI Inquiry Command and did not receive any
response or error status back.
v The service aid transmitted a SCSI Inquiry Command and the adapter indicated
a SCSI bus error.
v The service aid transmitted a SCSI Inquiry Command and an adapter error
occurred.
v The service aid transmitted a SCSI Inquiry Command and a check condition
occur.
When the SCSI Bus Service Aid is started a description of the service aid displays.
Pressing the Enter key displays the Adapter Selection menu. Use this menu to enter the
address to transmit the SCSI Inquiry Command.
When the adapter is selected, the SCSI Bus Address Selection menu displays. Use this
menu to enter the address to transmit the SCSI Inquiry Command.
After the address is selected, the SCSI Bus Test Run menu displays. Use this menu to
transmit the SCSI Inquiry Command by pressing Enter. The service aid then indicates
the status of the transmission. When the transmission is completed, the results of the
transmission displays.
Notes:
1. A Check Condition can be returned when the bus or device is working correctly.
2. AIX does not allow the command to be sent if the device is in use by another
process.
Chapter 6. Introduction to Tasks and Service Aids 133