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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 10: The Small Computer System Interface, SCSI

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SCSI IDs
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SCSI Bus Termination
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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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SCSI IDs
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SCSI Bus Termination
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