IBM manual Step, SP Switch function MAP, 1-32 RS/6000 SP SP Switch Service Guide

SP Switch function (MAP 0620)

vS00-BH-J9

5.Disconnect the switch data cable at the tailgate of the frame containing the processor node.

6.Connect the end of the processor node data cable to the jack.

7.Run advanced diagnostics on ªcss0º on the ªtestº processor node and its associated switch port.

vDo not perform the cable wrap test.

vRefer to ″Running diagnostics in a processor node″ in RS/6000 SP: System Service Guide.

8.Look for an SRN indicating a clock problem (such as ªExternal clockº).

9.Do the ªcss0º diagnostics fail with an indication of a clock problem?

vIf yes, go to ªStep 0620-031º.

vIf no, go to ªStep 0620-030º.

Step 0620-030

The ªcss0º diagnosticsdo not fail with an indication of a clock problem. This indicates that the problem is either in a cable or in the reported SP Switch.

1.Replace switch data cable that originally supplied the switch clock to the failing SP Switch.

2.Set the switch clock selection on this SP Switch to the original (correct) setting.

3.From the control workstation of the primary node reinitialize the switch by entering:

Estart

4.Check /var/adm/SPlogs/css/out.top file to see if problems are still reported on all data cables connected to this SP Switch.

5.Are there still problems reported on all data cables connected to this SP Switch? v If yes:

a.You have isolated the clock problem to the reported SP Switch.

b.Return to ªStep 0620-028º on page 1-31.

vIf no:

a.Clock problem resolved for this SP Switch.

b.Go to ªStep 0620-042º on page 1-35.

Step 0620-031

The ªcss0º diagnosticsfail with an indication of a clock problem. This indicates that there is a problem with switch clock source SP Switch.

1.Replace clock card in the clock source SP Switch.

2.Make sure to reconnect all cables connected to the clock card.

3.Set the switch clock selection on this SP Switch to the original (correct) setting.

4.Return to ªStep 0620-028º on page 1-31.

Step 0620-032

The clock settings on the problem switch appear to be okay and the problem switch is mounted in a frame that also contains processor nodes.

1.Check the ground straps connected to the ªproblemº frames.

v Ground straps are connected at bolts near the cable escapes inside the bottom rear of each frame.

vFor a view of a ground strap connection, refer to RS/6000 SP: Installation and Relocation.

2.Do all ground straps connecting the frames make adequate contact at both ends?

vIf yes, go to ªStep 0620-033º on page 1-33.

vIf no:

a.Fix or replace ground strap between the frames.

b.Go to ªStep 0620-043º on page 1-36.

1-32RS/6000 SP: SP Switch Service Guide