Replacing the SAN Volume Controller 2145-8G4 service controller

Use the following information to replace the SAN Volume Controller 2145-8G4 service controller.

1. Gently push the service controller (shown in Figure 1) into the frame until the rear connectors are fully seated and the service controller front metal work is up to the frame.
   Figure 1. SAN Volume Controller 2145-8G4 service controller
2. Slide the SAN Volume Controller 2145-8G4 back into the rack and check that all cables are still firmly in place.
3. Connect the power cable to the node and replace the cable-retention bracket. See Replacing the cable-retention bracket.
   
   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 4, you might have to re-zone 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.
4. 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 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:

   1. 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.
      
   2. Start the node by performing a node rescue. See Performing the node rescue.
   3. 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.