Comment 7 for bug 1421439

I reproduced this bug in MOS 6.0 (build 56) on env: Ubuntu, HA, Neutron VLAN, 3 controller, 2 compute with ceph rbd
VMs were created with volume in Ceph (Create a volume from an image and boot an instance from that volume).

created before changing image

root@node-5:~# egrep 'model type|target dev|rbd' /etc/libvirt/qemu/instance-00000001.xml
      <source protocol='rbd' name='volumes/volume-3df361cb-8fb2-4e87-be8b-020cefb60871'>
      <target dev='vda' bus='virtio'/>
      <target dev='tapeb3de376-13'/>
      <model type='virtio'/>
      <model type='cirrus' vram='9216' heads='1'/>

created after changing image

root@node-5:~# egrep 'model type|target dev|rbd' /etc/libvirt/qemu/instance-00000004.xml
      <source protocol='rbd' name='volumes/volume-914b70bc-6ae4-4445-bd0c-65f7a02e0bb1'>
      <target dev='vda' bus='virtio'/>
      <target dev='tapd66a80e9-ce'/>
      <model type='rtl8139'/>
      <model type='cirrus' vram='9216' heads='1'/>
root@node-5:~#