It should not have any negative interference on configuration issues,
but
it could have a negative impact on performace of your ovirtmgmt network, in case your OVN traffic saturates the connection.
>Cannot edit Interface. External network cannot be changed while the virtual machine is running.
The error message is incorrect (it predates the introduction of nic hotplugging)
It is enough to unplug/plug the nic before/after doing changes (the nic must be in the unplugged state to change it).
As far as I know there is already a bug reported about the error message being incorrect.
>With missing authentication do you mean that I could set up a non-oVirt
host installing controller and driver parts an let it join the others
without control?
There are two problems that relate to authentication:
- ovirt-provider-ovn does not authenticate request. Currently anyone can send requests to it, and create/delete networks or ports. This should be implemented in the near future.
- no authentication to access to OVN databases. A workaround for now could be putting OVN management traffic on a private network not accessible from outside. This is be implemented by the OVN team.
>In the sense that the tunnel basically already realizes the isolation
from the ovirtmgmt network itself (what usually we do making vlans)
without >interfering in case I have a great exchange of data for example
over the tunnel between 2 VMs placed on different hosts?
If the traffic going over the tunnel saturates that link, it will interfere with with your ovirtmgm traffic. For testing this setup should be ok, I would not recommend it for production.
>BTW: does it make sense to create another vlan on the bonding (that is
already setup with vlans), assigning an ip on the hosts and then use it?
The tunnel should take care of the isolation, so I don't think it would add any value.
>The same question could also apply to a general case where for example
my hosts have to integrate into a dedicated lan in the infrastructure
(eg for backup or monitoring or what else)... would I configure this lan
from oVirt or better from hosts themselves?
Any configuration changes made manually would cause ovirt to see them as unsynchronized. To do it cleanly you would have to hide the nics used for this by adding them to 'hidden_nic' in vdsm configuration (nics ignored by ovirt). Let me know if you want more information on this.
If you need a network to be used by the host, a better solution would be to just create a separate network from ovirt (a non-vm network if you don't need a bridge on top of the nic).
Marcin