Storage Area Network What is the difference between a LUN and a volume?

Chandanshivebharti ∙

Lvl 1

∙ 9y ago

Updated: 8/21/2019

LUN = Logical Unit Number
Volume = a physical disk

Depending on how the storage is configured a LUN may correspond to:

a single physical volume as a single logical unit
several physical volumes being treated as a single logical unit
one partition within a physical volume formatted as several partitions (with each partition as a single logical unit)

The concept of a LUN makes it easy for programs to access the disks and makes it easy to perform maintenance on the disks by shuffling the LUNs between physical disks as needed. The programs do not need to be changed or reconfigured when a physical drive is removed, replaced, or upgraded to one of greater capacity (or converted to RAID storage).

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∙ 9y ago

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