Simple definition
A unique identifier used by ports Fibre Channel.
Technical definition
World Wide Port Name identifies HBA ports and storage controllers in a FC fabric.
What is it used for ?
Create the zoning and present the LUN the right servers.
Practical example
One switch SAN authorizes the WWPN of an ESXi to communicate with the WWPN Bay.
Common issues
- WWPN miscopy
- Port replaced
- Zoning related to the wrong initiator
Related terms
Key takeaway: Exact behavior and commands may vary depending on versions, products and architectures.