The same memory over-subscription logic should be applied on a live-migration as would be applied to a normal instance boot. This issue is fixed upstream in mitaka with: https://github.com/openstack/nova/commit/f5e35dcf addressing: https://bugs.launchpad.net/nova/+bug/1214943 The purpose of this BZ is to evaluate the potential for backporting that fix to OSP5.
*** This bug has been marked as a duplicate of bug 1172272 ***