Reading this: http://communities.vmware.com/thread/429617?start=0&tstart=0
It sounds like the best plan to go to 5.1 and VMFS5 is to not upgrade datastores from VMFS3, but to delete them and create new, VMFS5.
I have 3 hosts total: one is 4.0, one is 4.1 Update 1 and one is 5.1. The 5.1 host is brand new and I am just now creating the datastore, and must choose VMFS-3 or VMFS-5.
Correct me if I'm wrong, but I can simply move/copy my VMs from my 4.x hosts on VMFS3 to the new 5.1 VMFS5 using Veeam, or scp or whatever, and they should run fine, correct? After a process of converting them I assume. Once I get this new server built, I can move all VMs off a 4.x at a time to delete the datastore/create new VMFS5.
I do not have shared storage and do not use vmotion. I use Veeam mostly to mitigate a lack of shared storage, but also simply do scp moves/copies using the shell.
tl;dr: should I stick with VMFS-3 on all 3 hosts or make the move to VMFS-5 on my new 5.1 host?