ServerNet Cluster Manual

Troubleshooting and Replacement Procedures
ServerNet Cluster Manual—520575-003
7-26
Checking the Internal ServerNet X and Y Fabrics
In clusters using the split-star topology, if a lane fails, traffic is redirected as shown in
Table 7-3.
Split-star topologies using G06.12 software (or G06.09 through G06.11with SPRs) do
not support automatic link fail-over on the four-lane links. The failure of a switch-to-
switch lane in this case brings down a subset of the node-to-node paths on a fabric.
For example, if a lane fails for traffic using port 8 between the X1 and X2 cluster
switches, the following paths are downed:
•
All X-fabric IPC paths between ServerNet nodes 1 through 8 and 9 through 10
•
All X-fabric IPC paths between ServerNet nodes 9 through 16 and nodes 1
through 2
However, paths on the Y fabric remain functional.
Checking the Internal ServerNet X and Y Fabrics
You can use a guided troubleshooting procedure, the TSM Service Application, or SCF
to check the internal ServerNet fabrics.
Using the Fabric Troubleshooting Guided Procedure to
Check the Internal ServerNet Fabrics
You can use the Troubleshoot ServerNet Fabric guided procedure to troubleshoot an
internal fabric.
From the system console, choose Start>Programs>Compaq TSM>Guided
Troubleshooting Tools>Troubleshoot ServerNet Fabric. Documentation for the
guided procedure is contained in the online help for the procedure.
The procedure guides you through the process of selecting a plug-in card (PIC) to
troubleshoot and running internal and external loopback or tests on the PIC. The
procedure prompts you to replace PICs and ServerNet cables as necessary.
Table 7-3. Automatic Fail-Over of ServerNet Traffic on a Four-Lane Link (X or Y
Fabric)
If a lane fails
for traffic
using port . . .
Traffic is
redirected to the
lane using port . . .
89
910
10 11
11 8