max LUN size for ESXi v4

Is the max LUN size for ESXi v4 2 TB?  My goal is to create a RAID 6 array with a size of 3 TB.. But..  As I read it seems that ESXi has a limit to 2 TB in regards to LUNS.  Is this true?  I know with NAS shares I can go larger for I'm already doing so, however, in this scenario I'll only have local storage.
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Yes...your max can only be 2TB.


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Paul SolovyovskySenior IT AdvisorCommented:
The max size for a LUN is 2TB-512B  

You can create a 3TB datastore with datastore extents but not typically recommended.  You would create a 2TB and 1TB LUN and then add the 1TB LUN as an extent.  Not sure if you can do this wiht local storage though but LUNs should be ok (block level SAN)

NFS datastores can be larger than 2TB but not recommended as well

Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
So you understand the different, it's a limit which is set by VMWare VMFS, which paulsolov has stated is 2TB - 512bytes, this also applies to virtual machine disk size.

Also Maximim LUN size is also 2TB - 512 bytes, as has already been stated.

As NFS is not VMFS, and is the native filing system of a NAS, it does not have the 2TB - 512bytes limit.

If interested in reading more configuration maximums, checkout the following document

Configuration Maximums for VMware« vSphere 4.1
gopher_49Author Commented:
This is how I thought it was.  I just wanted to double check.  Looks like I'm stuck with a RAID 6 config with 4 x 1 TB drives that will equal 2 TB or a RAID 5 with 3 x 1 TB that will equal 2TB and another 1 TB set aside for a hot spare.  I think I'll go with the RAID 6 config for there's more fault tolerance and performance isn't much of a concern for the internet will be the bottleneck..  it will be used as an online backup target.

Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Some array (HP, Dell) controllers, allow you to create the Array of 3TB, but then allow you to carve this up into LUNs, Logical Disks, Virtual Disks (each vendor refers to differnet names) smaller than the original 3TB. So you could have an RAID 6 array 4 x 1TB, but then could be reduced to smaller logical units, for a VMFS partition.

Just note RAID 6 doesn't perform very well. If performance, and writes is your concern.
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