To kill off slapd safely, you should give a command like this:
kill -INT `cat $(ETCDIR)/slapd.pid`
Killing slapd by a more drastic method may cause it's databases to be
corrupted, as it may need to flush various buffers before it exits. Note that
slapd writes its pid to a file called slapd.pid in the directory you configured
in slapd.conf file, for example: /usr/local/var/slapd.pid
Slapd will also write its arguments to a file called slapd.args in the
directory you configured in slapd.conf file, for example
/usr/local/var/slapd.args
