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[Alessandro Pilotti <1294682@xxxxxxxxxxxxxxxxxx>]

Converted in blueprint: https://blueprints.launchpad.net/nova/+spec/add-
differencing-vhdx-resize-support

Merged in Juno

** Changed in: nova
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1294682

Title:
  Hyper-v VHDX resizing not working when using differencing images

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  When spawning a new VM using cow images, the root image won't get the
  size of the flavor. Instead, it will have the size of the base image
  no resize is attempted. In this case, the proper size should be
  specified when creating the differencing image.

  If after that one attempts to resize the VM, the
  get_internal_vhd_size_by_file_size method will raise an exception as
  it can't get this info out of the differencing image. Instead of
  raising this exception, this method may recurse by calling itself on
  the parent of the differencing image. This happens on both V1 and V2
  namespaces.

  Trace: http://paste.openstack.org/show/73825/

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