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Chapter 8. KZPCM Host Adapter Diagnostics
EK–KZPCM–UG. B01 8–5
8.5 Checking the SCSI Bus Termination
A very common SCSI problem is incorrect termination. Refer to Chapter 2,
Installing the KZPCM Host Adapter
, to determine if the bus is terminated
correctly at both ends of the bus, and that no device in the middle has
termination enabled.
8.6 Testing the SCSI Ports
EXER
, a built in test at the SRM console of most systems, can be used to
determine if the SCSI ports and disks are functioning correctly.
>>>
exer dkb*&
This command instructs
EXER
to test all disks (
dk
) on the
b
channel (
dkb*
).
The
&
instructs the console to run the command as a background process.
Issue the
show_status
command to diagnose the port:
>>>
show_status
ID Program Device Pass Hard/Soft Bytes Written Bytes Read
-------- -------- ------------- ---- --------- ------------ ----------
00000001 idle system 0 0 0 0 0
000001b9 exer_kid dkb0.0.0.300 0 0 0 0 502272
EXER
will run until it is interrupted with the
kill_diag
command.
>>>
kill_diag
>>>
show_status
ID Program Device Pass Hard/Soft Bytes Written Bytes Read
-------- ------- ------ ---- --------- ------------- ----------
00000001 idle system 0 0 0 0 0
Observe the Hard/Soft error counts from the tests. Hard errors should always be
0. Soft errors are usually 0, and if non-zero, usually indicate a bus that is
incorrectly terminated.