NetApp
Configuration > Protocols > FC/FCoE : Managing FC : Changing an FC node name

Changing an FC node name
If you replace a storage system chassis and reuse it in the same Fibre Channel SAN, the node name of the replaced storage system in certain cases might be duplicated. You can change the node name of the storage system by using the Edit Node Name dialog box.
Steps 
1.
From the Home tab, double-click the appropriate storage system.
2.
In the navigation pane, click Configuration > Protocols, then click your FC protocol.
3.
Click Edit.
4.
Type the new name and click OK.