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[Alan Pevec <1379212@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova/juno
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1379212

Title:
  Attaching volume to iso instance is failure because of duplicate
  device name 'hda'.

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) juno series:
  New

Bug description:
  I try to attach a volume to iso instance, return code of volume-attach
  api is 200 ok, but the volume can't be attached to instance in fact,
  there are some error messages in nova-compute.log like this
  'libvirtError: Requested operation is not valid: target hda already
  exists'.

  The root device of iso instance is hda, nova-compute should not assign
  hda to cinder volume again.

  The following is reproduce steps:

  1. boot instance from iso image.
  2. create a cinder volume.
  3. try to attach the volume to iso instance.

  Attaching volume is failed, I can find libvirt error in nova-
  compute.log.

  http://paste.openstack.org/show/105144/

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