WWN Address Identity Pools
A Fibre Channel node and port must have a globally unique World Wide Number; in Cisco UCS they are created as identity pools. A Fibre Channel node (a whole server, storage array) must have a World Wide Node Name (WWNN) and a Fibre Channel port must have a World Wide Port Name (WWPN). Both WWNNs and WWPNs are physical entities; hence, they have a 64-bit address.
WWNN Pools
The WWNN pool is created as one large pool for the Cisco UCS domain. You can use the default pool in the Cisco UCS Manager SAN tab. However, it is recommended to create a custom WWNN pool for that UCS domain, which makes your Cisco UCS solution unique ...
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