Hi Jim,
Thanks for the fast response.
Both nested ESXi VM's did reside on the same NFS DataStore. I migrate ESXi5-2 to another Datastore and tried the VMotion again but it still fails.
There's some communication issue occurring between vCenter and this host for some reason.
I'll have to do some more digging around in the logs, I could just simply destroy the ESXi VM and deploy a new one but I want to understand what's causing the issue.
Cheers
Scott