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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => havana-1

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https://bugs.launchpad.net/bugs/1152368

Title:
  Hyper-V driver fails to boot instance if root.vhd already exists

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Under some circumstances the Hyper-V driver may boot the wrong image.
  The following steps should reproduce the problem:

  1. Create an OpenStack environment using stack.sh.
  2. Create a Hyper-V compute node for that environment.
  3. Boot an instance on the Hyper-V node.
  4. Re-run stack.sh without removing the instance.
  5. Stop and delete the instance through Hyper-V manager.  By default this does not remove the disk images associated with the instance.
  6. Attempt to boot a different image from OpenStack.  Because Nova will try to use the same instance name due to the re-stack, and a disk image already exists in that location, the old image will actually be booted.

  This is primarily a development and test issue since those are the
  environments where this is most likely to happen.  Even so, Nova
  should ensure that when a new instance is booted it comes up with the
  correct image.

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