- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 5
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:
echo -n "Reloading $prog: "
trap "" SIGHUP
killproc $DAEMON -HUP
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.