IBM RS/6000 SP, Service Manual

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v
If yes, go to “Step 0620-027”.
v
If no:
a. The problem switch is providing the master clock for the system.
b. Have customer use the Eclock command to select a different master clock for the system.
c. Go to “Step 0620-043” on page 1-36 to verify fix.
Step 0620-027
The clock selection is set to one of the External clocks.
1. Select a different external clock for this SP Switch.
2. From the control workstation of the primary node reinitialize the switch by entering:
Estart
3. Check /var/adm/SPlogs/css/out.top file to see if problems are still reported on all data cables
connected to this SP Switch.
4. Have some of the problems reported on data cables connected to this switch assembly been resolved?
v
If yes, go to “Step 0620-029”.
v
If no, go to “Step 0620-028”.
Step 0620-028
None of the problems reported on data cables connected to this SP Switch been resolved by selecting a
different external clock. This indicates a probable problem with switch clock card or switch planar in this
SP Switch.
1. Replace the clock card in this SP Switch.
2. Make sure to reconnect all cables connected to the clock card.
3. Reconnect cables S00-BH-J1, S00-BH-J2, S00-BH-J3, S00-BH-J5, and S00-BH-J7 at tailgate of this
SP Switch.
4. Set the switch clock selection on this SP Switch to the original (correct) setting.
5. From the control workstation of the primary node reinitialize the switch by entering:
Estart
6. Check /var/adm/SPlogs/css/out.top file to see if problems are still reported on all data cables
connected to this SP Switch.
7. Are there still problems reported on all data cables connected to this SP Switch?
v
If yes:
a. You have a problem with switch planar.
b. Go to “Step 0620-041” on page 1-35 to replace switch assembly.
v
If no:
a. Clock problem resolved for this SP Switch.
b. Go to “Step 0620-042” on page 1-35.
Step 0620-029
Some of the problems reported on data cables connected to this SP Switch been resolved by selecting a
different external clock. This indicates a probable problem with the original external clock source.
1. Based on the original external clock selection, locate the frame which was sourcing the switch clock.
2. Locate a “test” processor node in this frame which can be used for service.
3. Disconnect the switch data cable for this processor node at the tailgate of the SP Switch.
4. Using the switch cabling list, locate the switch data cable at the frame containing the processor node.
One of the following cables sources the clock to the failing SP Switch:
v
S00-BH-J3
v
S00-BH-J5
v
S00-BH-J7
SP Switch function (MAP 0620)
Chapter 1. Maintenance Analysis Procedures (MAPs)
1-31