Fiber-Channel Terminology

• WWN (World-Wide Name) - the address of a controller (HBA on a host, controller on a RAID) connected to a Fiber-Channel network.
• LUN Masking - The operation of defining which WWNs may access a given LUN on a RAID attached to a Fiber-Channel network.
• Zones - Similar to VLANs in Ethernet - allows splitting the Fiber-Channel network to separate logical networks, where traffic cannot flow between different zones. Zones may span multiple fibre-channel switches.
• Name Server - a service on a Fiber-Channel switch, that collects a list of WWNs connected to it, and allows a host to see who is connected to the Fiber-Channel network (actually - the zones that contain the client sending the query).

Originally written by guy keren