Removing the SAN Volume Controller 2145-8A4 service controller

To remove the service controller, perform the following steps:

Turn off the node while ensuring that its data is mirrored and synchronized. See MAP 5350: Powering off a SAN Volume Controller node for more information.
Remove the cable-retention bracket and disconnect the power cable from the node. See Removing the cable-retention bracket.
Locate the recessed service controller release button on the left side of the controller, which is marked in blue, as shown in Figure 1.
Figure 1. SAN Volume Controller 2145-8A4 service controller release button
Use a small screwdriver to gently press the release button and release the catch while pulling gently forward on the service controller. The service controller will move slightly forward.
Note: If you meet any resistance, do not press harder, or you might damage the release mechanism.
You can stop pressing the release button and pull the service controller fully out of the frame
Note: When you replace a service controller, it is normal to change the worldwide node name (WWNN) of the new service controller to match the one that is being replaced. In this case, you will have two service controllers with the same WWNN. Clearly label the service controller that you are removing and indicate that its WWNN is now a duplicate and that it must not be connected to a SAN before its WWNN is reset.