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

[Dietmar Maurer]

> You can also use the named-export support.  Something like
> 
>    --nbd=127.0.0.1:1235
>    --blockdev=virtio-drive0 --blockdev=virtio-drive1 --blockdev=ide0-hd0
> 
> etc.
> 
> Then QEMU can migrate to nbd://127.0.0.1:1235/virtio-drive0.
> 
> > Or how can we guarantee that only one kvm process can write to that NBD
> device?
> 
> Why is this needed?

Security? I don't want that another process can write nonsense into my backup.