Oracle 11gR2 RAC Cluster Verify Errors – NTP

During an installation of Oracle 11gR2 Real Application Clusters we encountered the following warning when running the cluster verification utility:

./bin/cluvfy stage -pre crsinst -n ora005,ora006 -verbose

Checking NTP daemon command line for slewing option "-x"
Check: NTP daemon command line
  Node Name                             Slewing Option Set?
  ------------------------------------  ------------------------
  ora006                                no
  ora005                                no
NTP daemon slewing option check failed on some nodes
PRVF-5436 : The NTP daemon running on one or more nodes lacks the slewing option "-x"
Result: Clock synchronization check using Network Time Protocol(NTP) failed

The solution was to re-configure the NTP server as follows:

Edit theĀ /etc/sysconfig/ntpd configuration file and include the -x flag. For example, in our case we changed:

OPTIONS="-u ntp:ntp -p /var/run/"


OPTIONS="-x -u ntp:ntp -p /var/run/"

The NTP server was then restarted as follows:

service ntpd restart

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