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Volumes vs Luns in Netapp storage

I have done some reading about Netapp storage, the bark side about it is LUNs and Volumes.
If I understand the steps are :

-- Create an Aggregate (which is one to many physical disks)
-- Create Volumes (Which is one to many virtual disks that can span one to many physical disks created on an Aggregate)

--LUNs …. initially I thought that they were like volumes… still confused.

any explanation will be very much appreciated.

Thanks
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jskfan
Asked:
jskfan
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2 Solutions
 
Paul SolovyovskyCommented:
Pretty simple really.

Since Netapp is a filer the LUN is a file in a Netapp Volume

So..

Create a Netapp Volume that is somewhat bigger than the LUN so that it can have space for snapshots.  Snapshot reserve should be set to zero

Here's an example for iscsi LUN setup.  If you're doing with for Windows/Linux you can use Snapdrive to make the process much easier.

https://library.netapp.com/ecmdocs/ECMP1196995/html/GUID-ABD4D006-4643-407C-B73F-3B0B5ACC8B27.html
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Gerald ConnollyCommented:
My understanding is that a volume is what you map to for CIFS/NTFS, ie a file share, and a LUN is what you map to when using block-level services on the filer.

The aggregate is the underlying RAIDset that provides the storage space for either.
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jskfanAuthor Commented:
https://communities.netapp.com/thread/12702

on the above link, the way they explain it is:

from Netapp perspective
Aggregate : is bunch of physical disks
Volume : is like partition that can span multiple physical disks
LUN : is a big file that is inside the volume. the LUN is what gets presented to the host.

from the host perspective:
When the LUN is presented to it as a Disk (D,E,F,etc...) it can be formatted and partitioned by a host..Though I have never partitioned and/or formatted the SAN disk that is presented to to a host…
Most of the SAN disks I have seen , are mapped to hosts and are already partitioned as one big partition and formatted...
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jskfanAuthor Commented:
Thank you Guys!
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