Logical Unit Number - meaning and definition. What is Logical Unit Number
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What (who) is Logical Unit Number - definition

NUMBER USED TO IDENTIFY A LOGICAL UNIT IN COMPUTER STORAGE
Logical unit; Logical Unit; Logical Unit Number; SCSI LUN

Logical Unit Number         
<storage> (LUN) A 3-bit identifier used on a SCSI bus to distinguish between up to eight devices (logical units) with the same SCSI ID. (1999-02-11)
Logical unit number         
In computer storage, a logical unit number, or LUN, is a number used to identify a logical unit, which is a device addressed by the SCSI protocol or by Storage Area Network protocols that encapsulate SCSI, such as Fibre Channel or iSCSI.
Logical Unit         
<networking> (LU) A primary component of SNA, an LU is a type of NAU that enables end users to communicate with each other and gain access to SNA network resources. (1997-04-30)

Wikipedia

Logical unit number

In computer storage, a logical unit number, or LUN, is a number used to identify a logical unit, which is a device addressed by the SCSI protocol or by Storage Area Network protocols that encapsulate SCSI, such as Fibre Channel or iSCSI.

A LUN may be used with any device which supports read/write operations, such as a tape drive, but is most often used to refer to a logical disk as created on a SAN. Though not technically correct, the term "LUN" is often also used to refer to the logical disk itself.