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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.
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
** Tags: sparse
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block migration of qcow2 VMs copies all empty space
https://bugs.launchpad.net/bugs/1449687
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