service tool:
service dirsrv {start|stop|restart} instancedirsrv.
/usr/sbin directory and are run similar to the service start/stop command:
/usr/sbin/{start|stop|restart}-dirsrv instance/etc/dirsrv/slapd-instance_name/{start|stop|restart}-slapd/usr/sbin directory.
/usr/sbin/{start|stop|restart}-ds-adminservice dirsrv-admin {start|stop|restart}