Setup ntpd for 11g RAC / Clusterware

Linux  :
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Edit the followin file :/etc/sysconfig/ntpd

Add -x to the current option as follows:

# Drop root to id 'ntp:ntp' by default.
OPTIONS="-x -u ntp:ntp -p /var/run/ntpd.pid"

# Set to 'yes' to sync hw clock after successful ntpdate
SYNC_HWCLOCK=no

# Additional options for ntpdate
NTPDATE_OPTIONS=""

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HP-UX :

Add export XNTPD_ARGS="-x" to /etc/rc.config.d/netdaemons


Restart:
/sbin/init.d/xntpd stop


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Sun Solaris :
/sbin/init.d/xntpd start