Data ONTAP automatically sets the WWPNs on your target adapters during initialization. However, there are some circumstances in which you might need to change the WWPN assignments on your target expansion adapters or your onboard adapters.
Sometimes, you might need to set the new WWPN on a single adapter. In other cases, it is easier to swap the WWPNs between two adapters, rather than individually set the WWPNs on both adapters.