ServerNet Cluster 6780 Operations Guide (G06.28+, H06.05+)

Troubleshooting and Replacement Procedures
ServerNet Cluster 6780 Operations Guide—525606-003
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Using the Internal Loopback Test Action
3. In the tree pane, right-click either External_ServerNet_X_Fabric or
External_ServerNet_Y_Fabric and select Actions. The Actions dialog box
appears.
4. From the Actions list, select Node Connectivity ServerNet Path Test.
5. Click Perform action. The Action Status window shows the progress of the action.
6. Check for an alarm on External_ServerNet_X_Fabric or
External_ServerNet_Y_Fabric. If no alarm is present, the action completed
successfully.
If an alarm is present (an alarm bell appears next to the object), click the object to
select it. See Using OSM Alarms on page 3-11 for more information about the
alarm.
Using the Internal Loopback Test Action
The Internal Loopback Test action tests the circuitry of a plug-in card (PIC) installed in
an MSEB to determine if ServerNet traffic can pass through the PIC. You can use the
Internal Loopback Test action on a PIC installed in any port of an MSEB. However, you
can perform this action on only one PIC at a time.
The Internal Loopback Test action indicates with high probability whether or not the
PIC circuitry is operational or faulty. However, it does not test the connector on the PIC.
As a result, the Internal Loopback Test Action might succeed even though
communication through the PIC is not possible.
Typically, you use the Internal Loopback Test action to isolate the cause of a
malfunctioning ServerNet path where a PIC is part of that path. You can perform the
action with a ServerNet cable connected to the PIC. The action isolates the MSEB port
occupied by the PIC, preventing the port from sending or receiving ServerNet traffic
during the action. However, the action tests only the PIC and not the cable connected
to it.
1. Log on to the OSM Service Connection.
2. In the tree pane, navigate to the PIC you want to test. (PICs are subcomponents of
MSEBs.)
3. Right-click the PIC and select Actions. The Actions dialog box appears.
4. From the Actions list, select Internal Loopback Test.
5. Click Perform action. The Action Status window shows the progress of the action.
The action status indicates that the action completed or failed. If the action
completed, the PIC is probably functioning normally.
Caution. Use the Internal Loopback Test action only if you have been instructed to do so by
your service provider or by the repair action text for an OSM alarm. Do not use the Internal
Loopback Test action on a PIC that you believe is operating normally. Doing so shuts down
ServerNet traffic through the PIC.