IBM SAN Volume Controller, Hardware Maintenance Manual

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cannot add the node back into the cluster until the fibre-channel switches in the SAN are re-zoned.
Also, the host systems cannot access the fibre-channel ports on that node until the host systems are
rebooted.
To restore the WWNN, perform the following steps:
a. Determine the WWNN for the node by examining the vital product data (VPD) of the node or the
zoning that is defined in the SAN switch. Record the last five numbers of the WWNN for the
node that you are working on.
b. Start the node by performing a node rescue.
c. Change the node WWNN by performing the following steps:
1) On the front-panel display, press and release the down button until the Node panel is
displayed. Then press and release the right button until the Node WWNN: panel is displayed.
2)
Press and hold the down button, press and release the select button, and then release the down
button. The display switches into edit mode.
Edit WWNN
is displayed on line 1. Line 2 of the
display shows the last five numbers of the WWNN that is currently set. The first number is
highlighted.
3) Change the highlighted number to match the number from the VPD or from customer zoning.
Use the up and down buttons to increase or decrease the numbers. The numbers wrap F to 0
or 0 to F. Use the left and right buttons to move between the numbers.
4) When the displayed value matches the numbers in the VPD or customer zoning, press and
release the select button to accept the numbers. The Node WWNN: panel is displayed and the
second line shows the last five numbers of the restored WWNN.
Wait one minute. If
Cluster:
is displayed on the front panel, this indicates that the node is ready to be
added to the cluster. If
Cluster:
does not display, see "MAP 5000" in the IBM System Storage SAN Volume
Controller 2145 Troubleshooting Guide to determine how to solve this problem or contact the IBM support
center.
Replacing a disk drive and a service controller on the SAN Volume
Controller
When you replace a service controller at the same time that you replace the disk drive, you might not be
able to perform a node rescue because the nonvolatile memory in the “new” service controller does not
contain the operating system software required to do so.
Also, if you must replace the hard disk and the service controller at the same time, you cannot boot the
node to perform node rescue. If you find that you cannot run node rescue, then use the following
procedure to perform the rescue:
v
Swap the service controller with a service controller from a working node. The results are the
following:
– The “new” service controller that is swapped into the working node has its nonvolatile memory
updated when the node is booted from the hard disk.
– The service controller that is swapped into the failed node from the working node contains the
operating system that is required to perform node rescue on that failed node.
v
When all updates are complete, swap the service controllers again, returning them to their original
nodes.
Removing and replacing the SAN Volume Controller power-cable
assembly
Make sure that power to the SAN Volume Controller is turned off before you remove the power-cable
assembly. Turn off the node while ensuring that its data is mirrored and synchronized, as described in
MAP 5350 in the
IBM System Storage SAN Volume Controller 2145 Troubleshooting Guide .
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IBM SAN Volume Controller Hardware Maintenance Guide