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Reviewed:  https://review.openstack.org/51316
Committed: http://github.com/openstack/nova/commit/c63f4af000af191a9a70b6b62dbda40a5c9b59e5
Submitter: Jenkins
Branch:    milestone-proposed

commit c63f4af000af191a9a70b6b62dbda40a5c9b59e5
Author: Nikola Dipanov <ndipanov@xxxxxxxxxx>
Date:   Thu Oct 10 16:00:26 2013 +0200

    Libvirt: disallow live-mig for volume-backed with local disk
    
    This patch makes libvirt raise an error if a live migration was
    requested without shared storage for a volume-backed instance, if that
    instance has any local disks.
    
    The reason is that without shared storage, local disks will be
    re-created on the destination node which can result in loss of data.
    
    Change-Id: Ic96dabf6020e957309280862b325792faf44b1f5
    Closes-bug: 1236356
    (cherry picked from commit cf89e78a1b921adee5b1943600315b0637fdefdc)


** Changed in: nova
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1236356

Title:
  Havana libvirt live migration should not be allowed without shared
  storage, even for volume-backed VMs

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  The following patch related to bug #1074054
  https://review.openstack.org/#/c/17118/ mistakenly allows live
  migration without shared storage, if the instance is volume backed -
  only in the libvirt driver.

  Bug #1235182 made this issue visible.

  this is not the correct thing to do because even though the instance
  root disk is a cinder volume - the instance might have additional
  disks that need to be migrated. Currently - nova would just create
  them on the destination node.

  Two possible solutions are:

  1) Prevent non-block live migration without shared storage - effectively reverting  https://review.openstack.org/#/c/17118/
  2) Allow live migration ONLY for volume backed instances that have no local disks. This might be a preferred way of solving the issue, as there is value in having the flexibility to have live migrations without the overhead of setting up shared storage for volume-only VMs

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