gistfile1.xml

     <devices>
    <emulator>/usr/bin/kvm-spice</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none' discard='unmap'/>
      <source file='/opt/stack/data/nova/instances/a32cee1a-0625-444f-b3c9-2c2fb630bb9d/disk'/>
      <target dev='vda' bus='virtio'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </disk>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw' cache='none' discard='unmap'/>
      <source dev='/dev/disk/by-path/ip-10.10.8.112:3260-iscsi-iqn.2010-01.com.openstack.org.volume-0a107de0-aebe-42e7-a2a7-d74c12f7aa88.16687-lun-0'/>     
      <target dev='vdb' bus='virtio'/>
      <serial>0a107de0-aebe-42e7-a2a7-d74c12f7aa88</serial>
      <alias name='virtio-disk1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </disk>