Fibre-channel ports are identified by their physical port number and by a worldwide port name (WWPN).
The physical port numbers identify fibre-channel cards and cable connections when you perform service tasks. The WWPNs are used for tasks such as fibre-channel switch configuration and to uniquely identify the devices on the SAN.
The WWPNs are derived from the worldwide node name (WWNN) of the SAN Volume Controller node in which the card is installed.
The WWNN is in the form 50050768010XXXXX, where XXXXX is initially derived from the unit and is specific to a SAN Volume Controller node. You can change the XXXXX value by using the front panel to facilitate service controller concurrent replacement and to enable some concurrent upgrade operations.
The WWPNs are in the form 5005076801QXXXXX, where XXXXX is as previously stated and Q is related to the port number as follows:
| Port | Value of Q |
|---|---|
| 1 | 4 |
| 2 | 3 |
| 3 | 1 |
| 4 | 2 |