Comment 1 for bug 1368844

@tpatil block migration with attached volume is not valid since https://bugs.launchpad.net/nova/+bug/1398999 So, second case is not valid. Could you provide more info about first one: nova.conf from compute node, libvirt logs, instance state in nova, networking used. It will help to find source of the problem. Tested on similar env, instances booted from 3GB volumes migrates well.