Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu

[Dietmar Maurer]

Opening several NBD sockets 'nbd:127.0.0.1:1235' seems dangerous to me. One 
backup task
and easily write to the wrong port - there is no protection? Or how can we 
guarantee that
only one kvm process can write to that NBD device? 

>   transaction actions=[{'type': 'migrate-async',
>                         'destination': 'tcp:127.0.0.1:1234',
>                         'id': 'migration'},
>                        {'type': 'point-in-time-copy-async',
>                         'wait-for': 'migration',
>                         'device': 'virtio-drive0',
>                         'destination-device': 'nbd:127.0.0.1:1235'}]
>