System Troubleshooting
6-25
➌
The ST1 line shows the results of self-test. The entries are:
•
++ (dual processor)
•
+ (pass)
•
– (fail)
•
o (does not apply)
NOTE: If a uniprocessor fails self-test (ST1) in a multiprocessor system or if
both CPUs fail on a dual-processor module, there is no indication of the
failure in the self-test display. The failing processor is logically
disconnected from the backplane to prevent faulty system operation. The
processor failure is indicated by the control panel Fault light remaining
lit after power-up and the module’s self-test LED being off.
Since the I/O port module does not have a module-resident self-test, its entry for
the ST1 line is always "o".
➍
The BPD line indicates boot processor designation. When the system goes
through self-test, the processor with the lowest ID number that passes self-test
(ST1 line is +) becomes the boot processor, unless you intervene.
The results on the BPD line indicate:
•
The boot processor (B)
•
Processors eligible to become the boot processor (E)
•
Processors ineligible tobecome the boot processor (D)
This BPD line is printed three times. After the first determination of the boot
processor, the processors go through two more rounds of testing. Since it is
possible for a processor to pass self-test (at line ST1) and fail ST2 or ST3 testing,
the processors again determine the boot processor following each round of tests.
In Example 6-6, the first processor to pass self-test is chosen as the boot
processor.
➎
During the second round of testing (ST2) all processors run additional CPU tests
involving memory. In Example 6-6, results printed on the ST2 line indicate that
the processor 1 at node 0 failed ST2, while processor 2 at node 0 passed ST2
(+ –).
➐
During the third round of testing (ST3) all processors run multi-processor tests,
and the status of each processor is once again reported on the BPD line.
➑
The primary CPU also tests the I/O port module at this time.
