A term used in the context of devices connected to a SCSI controller. Each device on a SCSI controller has a SCSI ID, but each SCSI ID may have several...
An identifier used on a SCSI bus to distinguish among devices (logical units) with the same SCSI ID.
A logical unit number (LUN) is a unique identifier used on a SCSI bus that enables it to differentiate between up to eight separate devices (each of which is a logical unit). Each LUN is a unique number that identifies a specific logical unit, which may be a hard disk, tape drive, or other device which understands the SCSI protocol.
In computer storage, a logical unit number or LUN is an address for an individual disk drive and by extension, the disk device itself. The term is used in the SCSI protocol as a way to differentiate individual disk drives within a common SCSI target device like a disk array.