libvirt/tests/qemuxmlconfdata/disk-metadata-cache.xml

<domain type='qemu'>
  <name>QEMUGuest1</name>
  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
  <memory unit='KiB'>219100</memory>
  <currentMemory unit='KiB'>219100</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='x86_64' 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-x86_64</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'>
        <metadata_cache>
          <max_size>12345</max_size>
        </metadata_cache>
      </driver>
      <source file='/tmp/QEMUGuest1.img'/>
      <target dev='hda' bus='ide'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/tmp/QEMUGuest2.img'/>
      <backingStore type='file'>
        <format type='qcow2'>
          <metadata_cache>
            <max_size unit='kiB'>1024</max_size>
          </metadata_cache>
        </format>
        <source file='/tmp/backing-store.qcow'/>
        <backingStore/>
      </backingStore>
      <target dev='hdb' bus='ide'/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>
    <controller type='usb' index='0'/>
    <controller type='ide' index='0'/>
    <memballoon model='virtio'/>
  </devices>
</domain>