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:
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?