disable multipathd

Disable multipathd daemon:

chkconfig multipathd off

In addition, make sure the /etc/sysconfig/mkinitrd/multipath file has the following line:

MULTIPATH=NO

The /etc/multipath.conf file should contain the following:

# Blacklist all devices by default. Remove this to enable multipathing
# on the default devices.
blacklist {
        devnode "*"
}

reboot

Reference: http://magazine.redhat.com/2008/03/10/tips-and-tricks-how-can-i-disable-device-mapper-multipath-in-red-hat-enterprise-linux-5

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