<pool type='dir'>
  <name>vms</name>
  <uuid>751f8e7e-d2e9-463d-8ffe-d38f5e13a19b</uuid>
  <capacity unit='bytes'>0</capacity>
  <allocation unit='bytes'>0</allocation>
  <available unit='bytes'>0</available>
  <features>
    <cow state='yes'/>
  </features>
  <source>
  </source>
  <target>
    <path>/i/cant/believe/its/not/btrfs</path>
  </target>
</pool>