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[Hiroyuki Eguchi <1399098@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

I guess this process is to prevent a original disk image corrupting when expanding the disk size.
So qemu-img convert should be skipped when migrating and resizing
(when the disk image of new flavor is same the old one).

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

** Affects: nova
     Importance: Undecided
         Status: New

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

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

Status in OpenStack Compute (Nova):
  New

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

  I guess this process is to prevent a original disk image corrupting when expanding the disk size.
  So qemu-img convert should be skipped when migrating and resizing
  (when the disk image of new flavor is same the old one).

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

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