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[Dirk Mueller <1257355@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

running live migration with --block-migrate fails if the disk was
resized before (aka detached from the cow image). This is because
nova.virt.libvirt.driver.py uses disk_size, not virt_disk_size for re-
creating the qcow2 file on the destination host. in the case of qcow2
files, qemu-img however needs to get the virt_disk size passed down,
otherwise the block migration step will not be able to convert all
blocks.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1257355

Title:
  live migration fails when using non-image backed disk

Status in OpenStack Compute (Nova):
  New

Bug description:
  running live migration with --block-migrate fails if the disk was
  resized before (aka detached from the cow image). This is because
  nova.virt.libvirt.driver.py uses disk_size, not virt_disk_size for re-
  creating the qcow2 file on the destination host. in the case of qcow2
  files, qemu-img however needs to get the virt_disk size passed down,
  otherwise the block migration step will not be able to convert all
  blocks.

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