I’m afraid you lost me here:
But vOneCloud builds on top of VMware vCenter deployments and you stated that your reason to look into OpenNebula was the charge incurred for your current Openstack environment (powered by VMware)?
OpenNebula manages (preferably) VMs on hypervisors running KVM as virtualization technique. Openstack (I don’t know anything about “VMware Integrated Openstack” though) usually uses KVM as well. So, unless you want to exchange your Openstack-based KVM-VMs by VMs based on VMware’s virtualization layer, I don’t see how vOneCloud fits into this? Just curious 