Does 'service multipathd reload' command interrupt any previous multipathd working connections ?

It is safe to reload multipathd daemon while device-mapper-multipath paths are in use, as it does not impact any existing paths.

Looking through the /etc/init.d/multipathd script in reload section, we see the following code:

reload() {

echo -n "Reloading $prog: "

trap "" SIGHUP

killproc $DAEMON -HUP

RETVAL=$?

echo

}

The reload process sends a HUP signal to the multipathd daemon, which causes it to re-read the configuration file.

Device-mapper-multipath functions without the multipathd daemon running, however without multipathd, path failures will not be detected or handled.