Editing Logical unit number (section)

==Examples==
To provide a practical example, a typical multi-disk drive has multiple physical [[SCSI]] ports, each with one SCSI target address assigned. An administrator may format the disk array as a [[redundant array of independent disks|RAID]] and then [[partition (computers)|partition]] this RAID into several separate storage-volumes. To represent each volume, a [[SCSI]] target is configured to provide a logical unit. Each [[SCSI]] target may provide multiple logical units and thus represent multiple volumes, but this does ''not'' mean that those volumes are [[concatenation|concatenated]].  The computer that accesses a volume on the disk array identifies which volume to read or write with the LUN of the associated logical unit.

In another example: a single disk-drive has one physical SCSI port. It usually provides just a single target, which in turn usually provides just a single logical unit whose LUN is zero. This logical unit represents the entire storage of the disk drive.