If a VM startup fails with the following:
Running: xm create /onapp/config/jhb6ymcxzs0w9s Using config file "/onapp/config/jhb6ymcxzs0w9s".
Error: Device 0 (vif) could not be connected. ip link set vif1.0 name x1jveq6m5upw0q failed
Run the following commands to stop this service and to ensure that it doesn't start the next time it boots:
chkconfig NetworkManager off
This is likely to be due to NetworkManager running on the HV.