You still need to enable it in config fr now. I hope we 'll be able to improve the ui to enable it on a per backup setting later
The nbd protocol use the 10809 port in TCP by default. XO only read from this port f the host.
The Nbd setting is used for the whole xo, regardeless of the pool
The lock have been replaced by a select, which is more self explanatory . I think the main control pint is to check if there is multiple NBD network for a VM, XO use the first one returned by the Xapi, and it may be , for example, a managemet network as opposed to a backup / high speed one