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does LUN look just like a HDD

Posted on 2011-02-14
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Is LUN used in enterprise systems look like a regular PC's Hard disk- small and rectangle?

thanks
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Question by:anushahanna
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Richard2k4 earned 84 total points
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Depending on drive array hardware.  Generally yes.
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by:Paul MacDonald
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Do you mean are they physically the same (do they look like hard drives) or are they represented in Windows Explorer the same way?

In the first case, a LUN may actually be an array of disks, so the answer isn't necessarily yes but it can be.

In the second case, generally yes, they appear like any other disk drive in Windows Explorer.
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by:EnriquePhoenix
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A lun is a hard drive. It is made up of 1 or more hard drives that would normally reside in a SAN.  If you was going to attach it to a server it would generally be thru a iSCSI initiator (Ethernet) Or some kind of fibre switch.
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by:InterframeGap
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Just one note which you may already know - the configuration to get the LUN online vs a Hard Disk is much different and can be more time consuming.  However, once you do a few LUNs you will see it no different than a HD, in the end the LUN gives you more options in a shared storage design.  
Just in design you take more into consideration when you are using a LUN vs a local HD. Just  my opinion.

Just my thoughts.

Douglas
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by:andyalder
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Logically it looks like a hard disk to the operating system but physically it doesn't really have an appearance, it may for example look like this image:
IMG-7589.jpg
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by:anushahanna
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thanks for clarifying on my question.

andyalder, how many GB is the LUN you have pictured?
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by:Paul MacDonald
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Ha!  Those could all be 10MB drives (~2GB) or 1TB drives (~200TB)
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by:andyalder
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Could be any size LUNs since such an array would be carved up into lots of LUNs and shared between multiple servers using fibre channel or iSCSI.
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by:anushahanna
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thanks for the picture and the explanation.. helped me.
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by:InterframeGap
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Just a question completely off base - is this a vendor picture or a farm you have worked with?
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by:andyalder
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It's an EVA 8400, I found the pic on Google although I do play with them. I work for a reseller so have to build them.
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