Windows 2012 Expanding Cluster Volume Storage - Cluster Limit Failure

OS is Windows 2012 and I am trying to extend a cluster volume storage partition from 10 TB to 20 TB.  I have the LUN at 20 TB and Windows sees the 20 TB disk in both Disk Management and in Failover Cluster Manager -> Storage -> Disks.

I am following the procedure in the this TechNet article:
http://blogs.technet.com/b/chrad/archive/2010/07/15/cluster-shared-volumes-csv-extending-a-volume.aspx

When I run the extend command in DiskPart I get the following error:

Virtual Disk Service error:
The volume cannot be extended because the number of clusters will
exceed the maximum number of clusters supported by the file system.

I also get this same error when I try to extend the drive through Disk Management.

My disk partition is GPT so I should have a 256 TB storage limit.  

I've Googled around but could not find anything related to this issue for 2012.

Any suggestions on how to successfully extend my Cluster Storage Volume?

Thanks,

Al
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imalc3142Asked:
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Seth SimmonsSr. Systems AdministratorCommented:
you can't expand the volume beyond 16tb because when it was originally created, windows used a 4k cluster size which means the largest size that volume can be is 16tb

you're only 2 options are either create a new volume beyond the 16tb boundary or backup the data, format the entire volume (windows would default to a larger cluster size to support a volume larger than 16tb) and restre the data

the 256tb maximum assumes a 64k cluster size

http://social.technet.microsoft.com/Forums/windowsserver/en-US/46e3ccc9-3975-4675-9071-9be214592623/expanding-spanned-disk-over-15tb-failed-on-2008-r2-ent
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imalc3142Author Commented:
Thanks,
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Windows Server 2012

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