SP Switch function (MAP 0620)
5.Set the switch clock selections on the ªproblemº switches (refer to ªSelecting appropriate switch clocksº on page
6.Run advanced diagnostics on ªcss0º on the ªtestº processor node and its associated switch port.
vDo not perform cable wrap test.
vRefer to ″Running diagnostics in a processor node″ in RS/6000 SP: System Service Guide.
7.Look for an SRN indicating a clock problem, such as ªExternal clockº being listed as one of the failing components.
Note: Do not exit from diagnostics at this time, as it may be used in the following steps.
8.Do the ªcss0º diagnostics fail with an indication of a clock problem?
vIf yes, the clock problem is resolved. Go to ªStep
vIf no, go to ªStep
Step
The ªcss0º diagnostics failed at ªStep
1.Record current clock setting for the switch (internal/external).
2.From the control workstation, select the internal clock for this switch assembly.
3.Run advanced diagnostics on ªcss0º on the ªtestº processor node and its associated switch port. v Do not perform cable wrap test.
vRefer to ″Running diagnostics in a processor node″ in RS/6000 SP: System Service Guide.
4.Look for an SRN indicating a clock problem, such as ªExternal clockº being listed as one of the failing components.
5.Do the ªcss0º diagnostics fail with indication of a clock problem?
vIf yes, go to ªStep
vIf no, go to ªStep
Step
You have run the ªcss0º diagnostics.
1.At the SP Switch, check the data cable interposer (if present) and the switch data cable corresponding to the original external clock selection for any obvious problem such as a loose cable connection or swapped cables.
2.Determine which connection is the other end of the switch data cable checked in the step above. v Refer to Appendix A in RS/6000 SP: Installation and Relocation.
3.Check the switch data cable at the other SP Switch for any obvious problem such as a loose cable connection or swapped cables.
4.Do the switch data cables and any data cable interposers appear to be okay? v If yes, go to ªStep
v If no:
a.Fix the obvious cable connection problem.
b.Go to ªStep
Step
The switch data cables and the data cable interposers appear to be okay.
1.Swap the data cable with another one at
2.To provide a good clock, swap the switch data cable at the switch assembly with another one.
3.Reset the clock setting to that recorded in ªStep
4.Run advanced diagnostics on ªcss0º on the ªtestº processor node and its associated switch port.
vDo not perform cable wrap test.
vRefer to ″Running diagnostics in a processor node″ in RS/6000 SP: System Service Guide.
