You should be able to check type of share in WD mgmt interface. I am not very sure about the WD interface.
Also try following steps
- Ensure the NFS server supports NFSv3 over TCP. ESX/ESXi does not use UDP for NFS.
- The NFS server must be accessible in read-write mode by all ESX/ESXi hosts.
- The NFS server must allow read-write access for the root system account (rw).
- The NFS export must be set for either no_root_squashor chmod 1777.
Ensure the ESX/ESXi VMkernel IP is allowed to mount the NFS share by inspecting the export list.
Ensure the mount is exported by running exportfs -ato re-export all NFS shares.
- Check the following to ensure that the ESX/ESXi host is correctly configured to use an NFS share:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1005948