Linux host connectivity problem

Hi All,

I read Linux host connectivity guide, and it describe as following:

Disabling Linux Multipath

If you decide to upgrade to EMC PowerPath for path management of your servers’ storage, it is necessary to disable Linux Multipath before
installing EMC PowerPath or both multipathing applications will hold locks on the same devices, making the server unstable for use.
Prior to installing EMC PowerPath for Linux, perform the following steps:
1. As root, edit the /etc/multipath.conf file by commenting out all its present entries by inserting a # symbol at the beginning of each
    line entry in the configuration file that needs to be commented out, then add the following:

     • For all others:
          blacklist {
          devnode "*"

          }

2. From root, stop the multipath daemon, disable the multipath daemon, clear the device mapper table, and remove the Linux Multipath utility package:

     #> /etc/init.d/multipathd stop
     #> /sbin/chkconfig multipathd off
     #> /sbin/dmsetup remove_all
     #> /sbin/rpm -e `rpm -qa | grep multipath`

I cannot run above command and remove multipath.

I try to use GUI tool to remove multipath, but it remove it's depended applications.

So the system crashed, cannot boot.

what's correct way to disable linux multipath?

Thank you,

Dennis