storage pool and volume usage question

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Hi

I'm creating a storage volume in a storage pool (directory type).

I'd like to create a volume that creates a file in a sub directory under the directory that the pool points to but am not able to work out how, maybe it is not possible?

My pool was created using following xml...

<pool type='dir'>
  <name>nova-local-pool</name>
  <target>
<path>/home/pcarlton/openstack/stuff/instances</path>
    <permissions>
      <mode>0755</mode>
      <owner>1000</owner>
      <group>130</group>
    </permissions>
  </target>
</pool>

The volume was created using this xml...

stgvol_xml = """
<volume>
  <name>4291f96a-759a-4b8a-bfe2-7a8ccb118b75-disk</name>
  <allocation>0</allocation>
  <capacity unit="G">1</capacity>
  <target>
    <format type='qcow2'/>
    <permissions>
      <owner>1000</owner>
      <group>130</group>
      <mode>0644</mode>
      <label>image_overlay</label>
    </permissions>
  </target>
  <backingStore>
<path>/home/pcarlton/openstack/stuff/nova/instances/_base/07f224f72581f8e029e08ff96827d581b2321a7b</path>
  <format type='raw'/>
  <permissions>
    <owner>1000</owner>
    <group>130</group>
    <mode>0644</mode>
    <label>image_base</label>
  </permissions>
</backingStore>
</volume>"""

All works ok but I'd like the create the 'disk' file in /home/pcarlton/openstack/stuff/nova/instances/4291f96a-759a-4b8a-bfe2-7a8ccb118b75

Thanks

--
Paul Carlton
Software Engineer
Cloud Services
Hewlett Packard Enterprise
BUK03:T242
Longdown Avenue
Stoke Gifford
Bristol BS34 8QZ

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