Each such path from host to logical unit constitutes a distinct I_T_L nexus. In a multipath environment a single logical unit may have multiple paths for fault tolerance, load balancing, etc. I_T_L nexus - a path from a specific initiator via a specific target port to a specific logical unit.Each of these initiator/target pairs constitutes a distinct I_T nexus. Similarly in a FC fabric environment there may be many initiators which can “see” a given target port. In a FC fabric environment there may be many target ports visible to an initiator. I_T nexus - the path from a specific initiator (I) to a specific target (T).LUN is often (incorrectly) used to refer to the logical unit itself especially when there is only one logical unit on the target. Logical Unit Number (LUN) - this is the address of a specific logical unit in the context of a specific initiator addressing a specific target to which the logical unit is mapped.It may also refer to non-storage devices such as tape libraries (media changer) or communications devices.

Logical Unit - this is the SCSI standard name for a device such as a disk or tape which actually stores data.The distinction is clearer for RAID array controllers where a single target port may present several logical units. The term target is sometimes used (incorrectly) to refer to the logical unit, especially when the target supports only a single logical unit as is often the case for a disk or tape. Target - this is the SCSI standard name for the control port on a device such as a disk, tape, or library.

This is the device which initiates commands, for example, read a disk or rewind a tape.

Initiator - this is the SCSI standard name for what we commonly call the host bus adapter (HBA).

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