The FC protocol requires one or more supported host bus adapters (HBAs) in the host. Each HBA port is an initiator that uses FC to access the LUNs on the storage system. The HBA port is identified by a worldwide port name (WWPN).
You need to make a note of the WWPN so that you can supply it when you create an initiator group (igroup). To enable the host to access the LUNs on the storage system using the FC protocol, you must create an igroup on the storage system and provide the WWPN as an identifier. Then, when you create the LUN, you map it to that igroup. This mapping enables the host to access that specific LUN.
A host is cabled to a single FC switch that is connected by cable to redundant FC ports on a high-availability storage system. A fabric-attached single-path host has one HBA.
The redundant configuration avoids the single point of failure of a single-switch configuration.
A single host with a direct FC connection from the host HBA to stand-alone or high-availability storage system configurations.