I'd also like to chime in - we've had some discussions on -infra today about the partial upgrade issue, and collected the following notes on an etherpad. https://etherpad.openstack.org/p/neutron-partial-upgrades One of the things identified, was the complexity of the DVR feature in Neutron, and an attempt to simplify the partial upgrade job by not enabling the DVR feature. http://eavesdrop.openstack.org/meetings/networking/2015/networking.2015-07-06-21.00.log.html Clark Boylan has proposed a patch to create a new job that runs on multiple nodes, but does not have DVR enabled, in the hopes that having less moving parts will allow the multinode grenade work to continue on a parallel track, with bugfixes or additional work on the Neutron DVR feature not blocking the overall effort. The idea would be eventually to enable DVR, once we have taken care of all the other work that needs to be done. https://review.openstack.org/#/c/198906/ What is everyone's thoughts? -- Sean M. Collins