IBM SAN Volume Controller, Hardware Maintenance Manual

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8. Turn on the node.
Note: The worldwide port names (WWPNs) of the fibre-channel ports are derived from the
worldwide node name (WWNN) of the service controller. If you do not perform step 9, you might
have to rezone the fibre-channel switches if the switch zoning uses WWPN. You must restart the host
systems before they are able to access disks through this node.
9.
If you replaced the service controller as part of concurrent maintenance, you must rewrite the WWNN
on the new service controller. If you do not, and the fibre-channel switch zoning uses WWPNs, you
cannot add the node back into the cluster until the fibre-channel switches in the SAN are rezoned.
Also, the host systems cannot access the fibre-channel ports on that node until the host systems are
reconfigured.
The node finally stops with
Validate WWNN
in the front panel. Press select and use the left and right
buttons until either
Disk WWNN
or
Panel WWNN
is displayed. If you use
Disk WWNN
, which is what the
node was using before the service controller was changed, you do not have to reconfigure SAN
switches and applications.
Press and release the down button until
Use Disk WWNN
is displayed. If your selection is correct, press
Select to verify that the WWNN that you set matches the WWNN that you recorded when you
removed the service controller.
If the WWNN for the node is not correct, restore the WWNN by performing 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.
svc_bb1ka055
Figure 88. Raising the SAN Volume Controller 2145-CF8 locking levers of the slide rails of the rack
Chapter 2. Removing and replacing parts
87