During ClusterWare installation , show following errors:

Network Time Protocol (NTP) – This task verifies cluster time synchronization on clusters that use Network Time Protocol (NTP). Error:
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PRVF-5436 : The NTP daemon running on one or more nodes lacks the slewing option "-x" – Cause: NTP daemon on one or more nodes lacked slewing option. – Action: Shut down and restart the NTP daemon after setting the slewing option as follows: For Linux, edit /etc/sysconfig/ntpd and add -x to the command line option. For SUSE Linux, edit /etc/sysconfig/ntp and add -x to the OPTIONS variable. For AIX, edit /etc/rc.tcpip and add -x to the command line option. For HP-UX, edit /etc/rc.config.d/netdaemons and add -x to the command line option. For Solaris, edit /etc/inet/ntp.conf and add ‘slewalways yes’ and ‘disable pll’ in ntp.conf.

  Check Failed on Nodes: [node02, node01] 
Verification result of failed node: node02

Details:
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PRVF-5439 : NTP daemon does not have slewing option "-x" set on node "node02" – Cause: NTP daemon on the specified node does not have the slewing option set. – Action: Shut down and restart the NTP daemon with the slewing option set. In each case add -x to the ntpd command line options.
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Verification result of failed node: node01

Details:
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PRVF-5439 : NTP daemon does not have slewing option "-x" set on node "node01" – Cause: NTP daemon on the specified node does not have the slewing option set. – Action: Shut down and restart the NTP daemon with the slewing option set. In each case add -x to the ntpd command line options.
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Fix step

[root@node01 rpm]# service ntpd stop
Shutting down ntpd:                                        [  OK  ]
[root@node01 rpm]#

[root@node01 sysconfig]# cat ntpd
# Drop root to id ‘ntp:ntp’ by default.  Requires kernel >= 2.2.18.
OPTIONS="-u ntp:ntp -p /var/run/ntpd.pid"
[root@node01 sysconfig]# vi ntpd
[root@node01 sysconfig]# cat ntpd
# Drop root to id ‘ntp:ntp’ by default.  Requires kernel >= 2.2.18.
OPTIONS="-x -u ntp:ntp -p /var/run/ntpd.pid"
[root@node01 sysconfig]#

[root@node01 sysconfig]# service ntpd start
ntpd: Synchronizing with time server:                      [  OK  ]
Starting ntpd:                                             [  OK  ]
[root@node01 sysconfig]#

source:http://3qs.com/2011-06/07-prvf-5436-the-ntp-daemon-running-on-one-or-more-nodes-lacks-the-slewing-option-x-648.html