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

Troubleshooting and Replacement Procedures
ServerNet Cluster 6780 Operations Guide—525606-003
3-31
Replacing a Fiber-Optic Cable Between an MSEB
and a Switch-to-Node Port
Perform each step in the guided procedure up to and including removing the MSEB
from the enclosure. Then refer to the guided procedure online help for instructions on
replacing the PIC. When the PIC is replaced, use the guided procedure to reinstall the
MSEB in the enclosure.
Replacing a Fiber-Optic Cable Between an MSEB and a Switch-
to-Node Port
To replace a fiber-optic cable between an MSEB and switch-to-node port:
1. Before starting, check that the internal and external ServerNet fabrics served by
the cable opposite the one you are replacing are healthy. See Checking the
External ServerNet X and Y Fabrics on page 3-23. For example, if you are
replacing the cable for the X fabric, check that the internal Y fabric for all other
nodes and the external Y fabric are fully operational.
2. Review the information on connecting fiber-optic cables in the ServerNet Cluster
6780 Planning and Installation Guide.
3. Route the replacement cable between the MSEB and the switch port.
4. Disconnect the suspected bad cable from the MSEB and from the switch port.
5. If the replacement cable has dust caps, remove the dust caps and install them on
the suspected bad cable.
6. Connect the replacement cable to the switch port and then to the MSEB. Make
sure that you connect the replacement cable to the ports from which you removed
the suspected bad cable.
7. Use the OSM Service Connection to check for alarms, as described in Using OSM
Alarms on page 3-11.
8. After a while, most OSM alarms should clear automatically. If the alarms do not
clear, run the Node Connectivity ServerNet Path Test. See Checking the External
ServerNet X and Y Fabrics on page 3-23.
9. If the alarms persist, perform the repair actions for clearing the alarms.
Replacing a Fiber-Optic Cable Between Cluster Switches
The two different types of connections between switches in a layered topology are:
layer-to-layer connections and zone-to-zone connections. Before starting, read this
procedure all the way through, especially if your cluster switches are in different sites.
To replace a fiber-optic cable between two switches:
1. Use the SCF STATUS SUBNET $ZZSCL, PROBLEMS command to check
connectivity on the peer fabric. This command reports connectivity problems on all
nodes.
If connectivity is down on the peer fabric, repair the problem, if possible, before
attempting to replace a cable.