Node Time Requirements

In case of a clustered environment, ensure that each member node of the cluster is set as closely as possible to the same date and time. To do so, Oracle recommends using the Network Time Protocol (NTP) feature available in you operating systems, with all nodes using the same reference Network Time Protocol server.

For Oracle Cluster Time Synchronization Service (ctssd) to synchronize the times of the Oracle RAC nodes, NTP must be configured. If you are using NTP, then do the following:

1. Add the -x option to the /etc/sysconfig/ntpd file, and restart ntpd as follows:

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

2. Restart Network Time Protocol server:

   # service ntpd restart

3. Check the configuration level as follows:

   chkconfig --level 35 nscd on

4. Start the Name Service Cache Daemon (nscd):

   service nscd start