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
Storage Area Network protocols which 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.