[libvirt] Heartbeat and reboot issue

Hi, I currently testing a two-nodes HA-cluster with DRBD (Pacemaker, Heartbeat, DRBD). When the virtual machines (with KVM) are running on one node and I halt or reboot this node, heartbeat cannot migrate the resources to the other node. Then the virtual machines are unmanaged in both nodes. I think it's related to heartbeat and libvirt init order (libvirtd shouldn't stop before heartbeat) or some configuration is missing ? Thank you in advance. Best regards. Chaibi.