LUN (Logical Unit Number)

A unique identifier used on a SCSI bus to distinguish between devices that share the same bus.

A SCSI term that refers to a logical disk device composed of one or more physical disk mechanisms, typically configured into a RAID level.

A logical unit is a conceptual division (a subunit) of a storage disk or a set of disks. Logical units can directly correspond to a volume drive (for example, C: can be a logical unit). Each logical unit has an address, known as the logical unit number (LUN), which allows it to be uniquely identified.

Logical Unit Numbers (LUN) is the number assigned to a logical unit (a SCSI protocol entity).