Permission denied writing to NFS share from Proxmox

I have been testing the 0.6 release of OMV and all has been fine except that for the life of me I cannot get write permission on my NFS share.

If I'm not mistaken NFS uses the UID to determine write permissions? The ACL settings have root read and write.

root@omv:/media/0bcf78bb-148e-4224-ba78-59ed1aedfb32# stat proxmox
  File: `proxmox'
  Size: 93        	Blocks: 8          IO Block: 4096   directory
Device: 902h/2306d	Inode: 115607      Links: 6
Access: (2775/drwxrwsr-x)  Uid: (    0/    root)   Gid: (  100/   users)
Access: 2014-07-19 11:46:19.011590183 -0400
Modify: 2014-07-19 10:41:14.355478628 -0400
Change: 2014-07-19 11:45:56.551589539 -0400
Birth: -

On the NFS settings I have the IP address of my proxmox server and write permission is set. On the proxmox server it will successfully mount the NFS share and I can browse the files. I just can't write or make directories. Both servers are using root with id's uid=0(root) gid=0(root) groups=0(root).

Anything I'm missing?

I believe proxmox mounts nfs shares as root? Thats why I tried with root. If I did get it working with another user how could I get proxmox to mount it under a different user on reboot?