<disk type='network' device='disk'>
<source protocol='rbd' name='poolname/imagename'>
<host name='{fqdn}' port='6789'/>
<host name='{fqdn}' port='6790'/>
<host name='{fqdn}' port='6791'/>
</source>
<target dev='vda' bus='virtio'/>
</disk>