nova-controller@xc1-nova-controller:~/openstack/nova$ ./bin/nova-manage db sync
2012-02-20 15:18:16 DEBUG nova.utils [-] backend <module 'nova.db.sqlalchemy.migration' from '/home/nova-controller/openstack/nova/nova/db/sqlalchemy/migration.pyc'> from (pid=19946) __get_backend /home/nova-controller/openstack/nova/nova/utils.py:602