NPIV


NPIV or N_Port ID Virtualization is a Fibre Channel feature whereby multiple Fibre Channel node port IDs can share a single physical N_Port. This allows multiple Fibre Channel initiators to occupy a single physical port, easing hardware requirements in Storage Area Network design, especially where virtual SANs are called for. This allows each virtual server to see its own storage and no other virtual server's storage. NPIV is defined by the Technical Committee T11 in the Fibre Channel - Link Services specification.

N_Port initialization with and without NPIV

Normally N_Port initialization proceeds like this:
However with NPIV it may continue like this:
FDISC is an abbreviation for Fabric Discovery, or "Discover Fabric Service Parameters", which is a misleading name in this context. It works just like FLOGI.
N_Port is used to connect equipment ports to the fibre channel fabric Source: https://www.hpe.com/h20195/v2/GetPDF.aspx/4AA4-4545ENW.pdf