Hi there!
As stated in KB 1005930 (and several other places as this communities), the UUID of a NFS datastore is generated from a hash between server and folder. In my case I have all my VMs in some NFS datastore mounted by IP. Now I need to have everything mounted by FQDN, and for this purpose I have modified the host file on the ESXi. Once I mount NFS with FQDN, it is named with a (1) at the end, as said.
Now, my plan is to Storage vMotion everything. I have an empty ESXi with the NFS mounted by FQDN, and so named NFS01 (1). It is the same vol on the nas than NFS, but in VMware they have different UUID. My fear is if this Storage vMotion can suppouse any locking or corruption, as it is moving from one datastore to itself. I want to try this way because it's preferable avoiding cold migration (and stopping all VMs).
Working on 5.1 build 799733.
Any tip?
Thank you very much in advance for your time 
David