I've live migrated vm's from node2 to node1 (master server). Put node2 into maintenance mode, then reconfigure ntp.conf to sync with our new ntp server. While in maintenance mode, I've also ran yum update which updated the kernel from 2.6.18-126.96.36.199.37.el5xen to 2.6.18-188.8.131.52.44.el5xen. In the process, xen was also updated from 3.4.0-0.1.32.el5 to 3.4.0-0.1.39.el5.
After rebooting, I've put node2 back into active mode. But now I can't live migrate the vm's back into node 2. From node1, ovs_operations.log: