...
...
...
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='network' device='disk'>
      <driver name='qemu' type='raw' cache='writeback'/>
      <auth username=''>
        <secret type='ceph' uuid=''/>
      </auth>
      <source protocol='rbd' name='volumes/volume-cdd9809f-32e3-479c-9d27-64c2f6168'>
      </source>
      <target dev='vda' bus='ide'/>
      <serial>cdd9809f-32e3-479c-9d27-64c2f6168</serial>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
...
...
...