Reconfiguring LUNS on Netapp SAN and Vcenter 5.1

Hello experts - I need to reconfigure storage on my SAN/VMware environment and could use some guidance.  My environment consists of the following:

A single Netapp FAS2240-4 currently divided into six 1.9TB luns, three on the top controller and three on the bottom.

VMware Vcenter 5.1 with 14 virtual machines using the existing Netapp LUNS

I'd like to combine two of the 1.9TB LUNs into one larger LUN to expand capacity on my Windows 2012 file server.  I've migrated all of the VMs from LUN1 and LUN3 on the top controller so they are now empty with the exception of a folder called .vSphere-HA.  

First, I want to be sure that I can actually create a LUN that large for my version of VMware and that once I migrate the file server to it, that I can then continue to expand the existing drive which is currently at 1.5TB.  I keep seeing references to a 2TB limit but I'm not clear on exactly where that comes into play.  If I am in fact able to make full use of the larger LUN to expand the existing drive then my best guess as to how this would work is as follows:

1) Unmount LUN1 and LUN3 in Vcenter
2) Set each LUN to offline mode from the Netapp OnCommand System manager
3) Delete both LUNs
4) Create a new LUN from the newly available space
5) Add the new LUN to Vcenter
6) Migrate file server to new LUN
7) Extend drive

I want to be sure I'm not missing steps or planning this incorrectly so any feedback would be very much appreciated, thanks!
danbrown_IT ManagerAsked:
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Paul SolovyovskySenior IT AdvisorCommented:
you should be ok, vsphere 5.1 datastore can be up to 64 TB per mix/man guide
https://www.vmware.com/pdf/vsphere5/r51/vsphere-51-configuration-maximums.pdf
You are limited on virtual disk size to 2TB-512B so you can't grow a virtual disk more than that.
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danbrown_IT ManagerAuthor Commented:
Ouch, there goes that idea...no sense in making the LUNs larger if the virtual disk can't also be larger.  Does the 2TB limit on the virtual disk also apply to versions of VMware newer than 5.1?
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Paul SolovyovskySenior IT AdvisorCommented:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You will need to upgrade to 5.5 for virtual disks larger than 2TB
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danbrown_IT ManagerAuthor Commented:
Thanks!
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Paul SolovyovskySenior IT AdvisorCommented:
I would prefer that you create a new datastore since upgrading current datastore leaves in mixed mode.  Better yet create a NFS volume if you have NFS license on Netapp, resize down and up if needed.
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