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

** Changed in: nova
    Milestone: None => liberty-3

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https://bugs.launchpad.net/bugs/1399098

Title:
  qemu-img convert should be skipped when migrating.

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Currently, qemu image is always converted when resizing and migrating.

  Image conversion is done for migrate complete qcow2 image.

  But, It is unnecessary to merge the backing file in case of a shared storage 
environment.
  It's needed in case of a non shared storage environment. but _create_image() 
in finish_migration() tries to download backing file.

  So We can skip qemu-img conversion in both cases.

  I have modified so that nova-compute just copy the file instead of
  conversion.

  The qemu-img convert is IO heavy process, so I'd like to skip, if
  possible.

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