For the SAN Volume Controller 2145-8F2 and SAN Volume Controller 2145-8F4 models only: If you
cannot read the serial number or if you want to verify that it is correct, you can also find it on the
node vital product data (VPD).
Perform the following steps to find the serial number in the VPD:
a. Start the management GUI application.
b. Display the VPD for the failed node.
c. Note the system serial number.
2. Turn off the node while ensuring that its data is mirrored and synchronized. See MAP 5350 in the
IBM System Storage SAN Volume Controller Troubleshooting Guide for more information.
3. Remove the node from the rack and place it on a flat, static-protective surface. See “Removing the
SAN Volume Controller from a rack” on page 46.
4. Remove the top cover. See “Removing the top cover” on page 77.
5. Remove the Fibre Channel adapter cards from the frame assembly that you are replacing.
6. Remove the service controller from the frame assembly you are replacing.
7. Install the Fibre Channel adapter cards into the new frame assembly.
8. Install the service controller into the new frame assembly.
9. Replace the top cover. See “Replacing the top cover” on page 81.
10. Place the node in the rack. See “Replacing the SAN Volume Controller in a rack” on page 55.
11. Start the node using the node rescue procedure.
Note: If you have to install a new service controller in the frame assembly, you must perform the
next steps to allow the node rescue to find a suitable donor node.
a. Turn on the node. Use your SAN monitoring tools to determine the WWNN of the node.
b. Rezone the switch to allow at least one port of the replaced node to connect to at least one port
of an existing node.
c. Perform a node rescue.
d. Set the WWNN of the replacement node to match the node that it replaced. See "Node WWNN"
in the IBM System Storage SAN Volume Controller Troubleshooting Guide for more information.
e. Rezone the switch to its original settings.
f. Add the node back into the cluster.
g. Clearly label the original service controller to indicate that its WWNN has been re-used, and that
the part cannot be used without first changing the WWNN.
Attention: It is essential that you perform all the stages of the next step to ensure that the
replacement system is set to the serial number of the original machine.
12. If you are performing this repair as part of a fix procedure, you will be prompted to type the
machine serial number that you noted above. Otherwise, perform the following steps:
a. Delete the failed node from the cluster.
b. Add the repaired node to the cluster.
c. Start the command-line interface (CLI).
d. Issue the following command:
writesernum -sernum nodeserialnumber nodename
where nodeserialnumber is the number that you noted previously and nodename is the name of the
repaired node that you added in this step.
For example, to write the machine serial number to the system board when the serial number is
“13-FEDCB” and the node name is “ZYXW3,” you would issue the following command:
writesernum –sernum 13FEDCB ZYXW3
Note: The node will restart as soon as the serial number has been written to it.
176 IBM SAN Volume Controller Hardware Maintenance Guide
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