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What are LUNs?

Dear Experts,

What is a LUN? Why should I create LUNs, rather use simple disks?  Or iSCSI targets which I see as normal disks in disk manager? Please do not post links, please post short, but reasonable answers.

2 Solutions
LUN is logical presentation of physical disk(s). It is created at storage processor from available disks. SP will create volume/diskgroup(can use raid) to present the created disk(s) as LUN to host(s). SP can be physical device like netapp, hp eva or dell equallogic. Or it can be software based solution like OpenFiler or NAS. The presentation of disks can be tru fiber channel & iscsi.
Kevin LitmanNetwork AdministratorCommented:
If you have a SAN for example you can create a LUN that will show as a disk in Disk Manager. You will get far more storage capacity with a SAN than you would just disks in a server. Plus everything is centralized and you can have multiple servers with their own LUN's.
mkriszAuthor Commented:
I'm starting to understand this :]

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