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


From: Ansgar Hegerfeld
Subject: [Qemu-devel] [Bug 1449687] Re: block migration of qcow2 VMs copies all empty space
Date: Mon, 09 Jan 2017 21:40:46 -0000

There is a patch available: https://lists.gnu.org/archive/html/qemu-
devel/2016-11/msg03742.html (and those which are mentioned in the
responses)

** Changed in: qemu
       Status: New => Confirmed

** Tags added: sparse

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

Title:
  block migration of qcow2 VMs copies all empty space

Status in QEMU:
  Confirmed

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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