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Reference.org
Logical unit number
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<p>In <a href="/facts/Computer_storage/wPHKFpdx">computer storage</a>, a logical unit number, or LUN, is a number used to identify a logical unit, which is a device addressed by the <a href="/facts/SCSI/pxXulrBr">SCSI</a> protocol or by <a href="/facts/Storage_Area_Network/e7bmhrmB">Storage Area Network</a> protocols that encapsulate SCSI, such as <a href="/facts/Fibre_Channel/C7C0yreb">Fibre Channel</a> or <a href="/facts/ISCSI/oxaQpYBc">iSCSI</a>. </p><p>A LUN may be used with any device which supports read/write operations, such as a <a href="/facts/Tape_drive/9MfLuCa0">tape drive</a>, but is most often used to refer to a <a href="/facts/Logical_disk/UDeELzFr">logical disk</a> as created on a <a href="/facts/Storage_area_network/e7bmhrmB">SAN</a>. Though not technically correct, the term "LUN" is often also used to refer to the <a href="/facts/Logical_disk/UDeELzFr">logical disk</a> itself. </p>