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

[Thomas Huth]

Can you please reproduce bugs with the latest version of QEMU, i.e.
currently v2.11 ? Old versions like 2.5 are not supported by the
upstream QEMU project anymore, and bugs from such old versions might
have been fixed already. (Otherwise, if you're only interested in the
Ubuntu binary, please open a bug against the Ubuntu QEMU package
instead)

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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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