Comment 4 for bug 1421439

I cann't reproduce it too
Verified on mos 6.0 Ubuntu, Ceph RBD

  2014.2-6.0:
    VERSION:
      api: '1.0'
      astute_sha: 16b252d93be6aaa73030b8100cf8c5ca6a970a91
      build_id: 2014-12-26_14-25-46
      build_number: '58'
      feature_groups:
      - mirantis
      fuellib_sha: fde8ba5e11a1acaf819d402c645c731af450aff0
      fuelmain_sha: 81d38d6f2903b5a8b4bee79ca45a54b76c1361b8
      nailgun_sha: 5f91157daa6798ff522ca9f6d34e7e135f150a90
      ostf_sha: a9afb68710d809570460c29d6c3293219d3624d4
      production: docker
      release: '6.0'

VM was created before changing image

root@node-9:~# egrep 'model type|target dev|rbd' /etc/libvirt/qemu/instance-00000001.xml
      <source protocol='rbd' name='compute/8c3bce3f-dadb-4c39-b29f-921387a4540b_disk'>
      <target dev='vda' bus='virtio'/>
      <target dev='tapb52edcea-88'/>
      <model type='virtio'/>
      <model type='cirrus' vram='9216' heads='1'/>

VM was created after changing image

root@node-8:~# egrep 'model type|target dev|rbd' /etc/libvirt/qemu/instance-00000007.xml
      <source protocol='rbd' name='compute/c1234800-9f39-434b-886a-86b7db77d367_disk'>
      <target dev='hda' bus='ide'/>
      <target dev='tap5c401757-df'/>
      <model type='rtl8139'/>
      <model type='cirrus' vram='9216' heads='1'/>