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LUN Concept

psalm139
Occasional Contributor

LUN Concept

Hi all, could you please help me to understand the concept of lun?

what is a lun for? why to use it? what benefits i have?

thanks in advance.  :smileyvery-happy:

2 REPLIES
Steven E. Protter
Exalted Contributor

Re: LUN Concept

Shalom,

 

A LUN is a disk. It is normally presented to a system these days via Fiber through a Fiber Channel Controller sometimes called an HBA.

 

http://en.wikipedia.org/wiki/Logical_Unit_Number

 

That article explains it better than I can.

 

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Steven E Protter
Owner of ISN Corporation
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Patrick Wallek
Honored Contributor

Re: LUN Concept

>>A LUN is a disk.

 

Well, kind of.  As far as the HP-UX OS is concerned, that is basically correct.

 

You use them because you have to.  When you have a large disk array you carve the array into chunks that are visible to one or more systems.  Each chunk is a LUN.  Each server that can access the disk array can access the LUNs.

 

The server itself sees the LUN as "a disk".