HP 3PAR RedHat and Oracle Linux Implementation Guide

For the ALUA Setting in RHEL 6.2 or Later
For the ALUA Setting in RHEL 5.10 or later
3. Restart the multipathd daemon for any changes to be effective.
4. Verify that the multipathd daemon is enabled by the rc script to run on every host boot up.
The following output shows that it is enabled for run-level 3, 4 and 5. Enable it appropriately
for your configuration:
# chkconfig --list multipathd
multipathd 0:off 1:off 2:off 3:on 4:on 5:on 6:of
Configuring RHEL 6 FCoE Settings with Device-mapper Multipathing 101