[ovirt-users] live migration

Hi, I reinstalled one of my nodes (node1) because I have to replace my hdds. I installed centos 6.6 minimal, but on node re-adding procecure it installed newer qemu-kvm-rhev packages. Since reinstall I can run VMs on this node and I can do live migrate from this node to other, but not backwards. I remember, maybe one years ago it was required to install redhat's version of qemu-kvm-rhve package for this feature. Is it necessary yet? my versions: node0 KVM: 0.12.1.2 - 2.415.el6_5.14, LIBVIRT: libvirt-0.10.2-46.el6_6.1 node1 KVM: 0.12.1.2 - 2.448.el6_6.4, LIBVIRT: libvirt-0.10.2-54.el6 node2 KVM: 0.12.1.2 - 2.448.el6_6.4, LIBVIRT: libvirt-0.10.2-46.el6_6.1 Can I upgrade manual these hosts? I haven't restart my hosts because node0 and node2 is gluster replicate. Thanks in advance, Tibor