Time Difference between RAC Nodes

    If the time difference between the RAC nodes is out of sync (time difference > 30 sec) then it will result one of the following issues

    1. CRS installation failure on remote node
    2. RAC node reboots periodically
    3. CRS Application status UKNOWN or OFFLINE

    To avoid these issues, configure NTP (Network Time Protocol) on both nodes using any one of the following methods

    1. system-config-time or system-config-date or dateconfig

    Type command system-config-time or system-config-date or dateconfig at terminal --> Click “Network Time Protocol” ->check “Enable Network Time Protocol” and select NTP server --> Click OK

    2. date MMDDHHMMSYY
    Type command date with current date and time

    3. /etc/ntp.conf
    Update /etc/ntp.conf file with timeservers IP addresses and start or restart the ntp daemon
    $ /etc/init.d/ntp start
    or
    $ /etc/rc.d/init.d/ntp start

    Once RAC nodes are time sync you might need to shutdown and startup the CRS

    $ crs_stop -all
    $ crs_start -all