libvirt/tests/domainschemadata/backing-chains.xml

<domain type='qemu'>
  <name>QEMUGuest1</name>
  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
  <memory unit='KiB'>219136</memory>
  <currentMemory unit='KiB'>219136</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='i686' machine='pc'>hvm</type>
    <boot dev='hd'/>
  </os>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-system-i386</emulator>
    <disk type='network' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source protocol='gluster' name='Volume2/Image'>
        <host transport='unix' socket='/path/to/sock'/>
      </source>
      <backingStore type='file' index='1'>
        <format type='qcow2'/>
        <source file='/tmp/missing-backing-store.qcow'/>
      </backingStore>
      <target dev='vda' bus='virtio'/>
    </disk>
    <disk type='network' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source protocol='nbd' name='bar'>
        <host transport='unix' socket='/var/run/nbdsock'/>
      </source>
      <backingStore type='block' index='1'>
        <format type='qcow2'/>
        <source dev='/dev/HostVG/QEMUGuest1'/>
        <backingStore type='file' index='2'>
          <format type='qcow2'/>
          <source file='/tmp/image2.qcow'/>
          <backingStore type='file' index='3'>
            <format type='qcow2'/>
            <source file='/tmp/image3.qcow'/>
            <backingStore type='file' index='4'>
              <format type='qcow2'/>
              <source file='/tmp/image4.qcow'/>
              <backingStore type='file' index='5'>
                <source file='/tmp/image5.qcow'/>
                <format type='qcow2'/>
                <backingStore type='file' index='6'>
                  <format type='raw'/>
                  <source file='/tmp/Fedora-17-x86_64-Live-KDE.iso'/>
                  <backingStore/>
                </backingStore>
              </backingStore>
            </backingStore>
          </backingStore>
        </backingStore>
      </backingStore>
      <target dev='vdb' bus='virtio'/>
    </disk>
    <disk type='network' device='disk'>
      <driver name='qemu' type='raw'/>
      <backingStore/>
      <source protocol='gluster' name='Volume1/Image'>
        <host name='example.org' port='6000'/>
      </source>
      <target dev='vdc' bus='virtio'/>
    </disk>
    <disk type='network' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <auth username='myname'>
        <secret type='ceph' usage='mycluster_myname'/>
      </auth>
      <source protocol='rbd' name='pool/image'>
        <host name='mon1.example.org' port='6321'/>
        <host name='mon2.example.org' port='6322'/>
        <host name='mon3.example.org' port='6322'/>
      </source>
      <backingStore type='file' index='1'>
        <source file='/tmp/image.qcow'/>
        <backingStore/>
        <format type='qcow2'/>
      </backingStore>
      <target dev='vdd' bus='virtio'/>
    </disk>
    <disk type='block' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source dev='/dev/HostVG/QEMUGuest11'/>
      <target dev='vde' bus='virtio'/>
    </disk>
    <controller type='usb' index='0'/>
    <controller type='pci' index='0' model='pci-root'/>
    <memballoon model='virtio'/>
  </devices>
</domain>