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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/1163844

Title:
  Resize instance from large flavor to small flavor based on Hyperv
  driver, instance status is error and the phsical instance get
  destroyed

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Test script:
  1.Use flavor2 to deploy instance.
  2.When deployment success , resize it from flavor2 to flavor1.
  3.Instance status display error.

  Flavor1 information:
  1 CPU
  512M memory
  0G disk

  Flavor2 information:
  1 CPU
  2048M memory
  20G disk

  the root cause is, in current hyperv driver implementation, when to perform finish_migration operation, there is a check that the VHD can't be resize to a smaller size.
                  if new_size < curr_size:
                      raise vmutils.HyperVException(_("Cannot resize a VHD to a "
                                                      "smaller size"))
  but at this point, the old instance get already destroyed, so the data could be lost.

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