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Logical Unit Numbers (LUNs)
A SCSI device may contain up to eight
sub-devices or Logical Units, which are assigned Logical Unit Numbers
(LUNs)112 0 - 7. A good example is a tape backup system with
an auto-loader. Let us say the tape drive has the capac-ity to hold
7 tapes in a holder. By giving the holder a LUN of 1 for Sunday, 2
for Monday, etc., the tape drive would have only a single SCSI ID, but
each tape would have its own LUN. The auto-loader would know which
tape to load for each day of the week.
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112. http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci347534,00.html
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