Hello, This issue has been active since mid 2014 and still hasn't got any resolution or fixes merged. I'm pushing for a fix to this issue and anybody with help or feedback is welcome. Please see my last comment on https://bugs.launchpad.net/nova/+bug/1469179 regarding the old review which could be revived [1]. We have been running this patch in out testing and staging environment but I'm still reviewing it. We are now several people involved in this but I would like to have a lot of opinions about reviving this review. Best regards [1] https://review.openstack.org/#/c/200870/