[Qemu-devel] [Bug 1449687] Re: block migration of qcow2 VMs copies all empty space

[Thomas Huth]

** Project changed: qemu => qemu (Ubuntu)

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https://bugs.launchpad.net/bugs/1449687

Title:
  block migration of qcow2 VMs copies all empty space

Status in qemu package in Ubuntu:
  New

Bug description:
  I'm running openstack 2012.1 'icehouse' which, ultimately, calls down
  into qemu-system-x86 2.0.0+dfsg-2ubuntu1.10.

  I primed the process by copying all necessary base images onto the
  destination host.  Nonetheless, post-migration instances are much
  larger than the original image; the copy duplicated all the empty
  space that ought to have remained copy-on-write.

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