[Users] ovirt-node: cannot make new libvirtd.conf persistent

Hi all, I tried to make some changes to /etc/libvirt/libvirtd.conf on ovirt-node (the latest one) However, after reboot the old configuration keeps coming back. I tried "persist /etc/libvirt/libvirtd.conf"; the file is already persisted. OK, unpersisted the file, verified the change and persisted the file once more. Still, after reboot the old file keeps coming back. How can I make a persistent change to /etc/libvirt/libvirtd.conf on ovirt-node (ovirt-node-iso-2.6.1-20120228.fc18.iso)? Thanks! Winfried