IBM RS/6000 SP, Maintenance Information

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MAP 0120: Supervisor Bus Problem
shutdown procedure and power-off unit(s) from the control workstation, or defer maintenance until all jobs
are completed.
– Check that processor node or switch is not in use by customer before continuing.
– Put circuit breaker(s) at front of processor node or switch assembly in the Off (‘0’) position.
– Perform "Node/Switch Supervisor Self-Test" in
IBM RS/6000 SP: Maintenance Information, Volume 3,
Locations and Service Procedures. You can repeat this test as necessary.
– Check slot address indicated by self-test against physical location. In a frame with processor nodes, the
switch assembly is at slot address 17.
Does the supervisor card pass self-test, including the correct slot address?
Yes No
030
– If this is a 604, 604e, 332 MHz SMP,or POWER3 SMP node supervisor card, check that failure
is not base code related (see "Base Code Verification" in IBM RS/6000 SP: Maintenance Informa-
tion, Volume 3, Locations and Service Procedures). Otherwise continue.
– Go to Step 033.
031
– Perform all tests of "Verification Test for Supervisor Bus" in IBM RS/6000 SP: Maintenance Information,
Volume 3, Locations and Service Procedures.
Does verification test fail?
Yes No
032
Problem resolved.
– Go to “MAP 0570: End of Call” on page 1-357.
033
Attention: This step may interrupt use of another processor node, or switch assembly.
Attention: Powering off processor node(s) or switch assemblies in a parallel environment may cause all
jobs to flush from the queue and switch initialization to rerun.
– Perform "Supervisor Bus Swap Procedure" in
IBM RS/6000 SP: Maintenance Information, Volume 3,
Locations and Service Procedures, to determine if the problem is in supervisor harness or the unit
(processor node or switch assembly).
Does the good unit pass?
Yes No
034
– Replace the supervisor harness connected to this processor node or switch assembly.
– Go to Step 039 on page 1-26.
035
Problem is in the unit (processor node or switch assembly).
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RS/6000 SP MAPs