You're using the vSphere WEB client ? If not, try it.
I tried that already. Doesnt work.
Is this a new datastore ? or formatted on a previous version ?
Can you confirm the vmfs version ? and block size
Rich
Vmfs 5 1mb
On Tuesday, March 24, 2015, RichardBush <communities-emailer@vmware.com>
Can you tell us the Hardware Version of your VM ?
Take a look at this KB article for some troubleshooting:
VMware KB: Value out of range error message when adding disks larger than 4TB in vSphere Client
VMware KB: Support for virtual machine disks larger than 2 TB in VMware ESXi 5.5