RAC database installation INFO: PRVF-9652 : Cluster Time Synchronization Services check failed

Error:
During RAC installation of oracle software.
I am getting "INFO: PRVF-9652 : Cluster Time Synchronization Services check failed"

When testing the Cluster Time Synchronization Services check failed as below.

[grid@node-01 bin]$ ./cluvfy comp clocksync

Verifying Clock Synchronization across the cluster nodes

Checking if Clusterware is installed on all nodes...
Check of Clusterware install passed

Checking if CTSS Resource is running on all nodes...
CTSS resource check passed


Querying CTSS for time offset on all nodes...
Query of CTSS for time offset passed

Check CTSS state started...
CTSS is in Observer state. Switching over to clock synchronization checks using NTP


Starting Clock synchronization checks using Network Time Protocol(NTP)...

NTP Configuration file check started...
PRVF-5402 : Warning: Could not find NTP configuration file "/etc/ntp.conf" on node "node-01"
PRVF-5405 : The NTP configuration file "/etc/ntp.conf" does not exist on all nodes
PRVF-5414 : Check of NTP Config file failed on all nodes. Cannot proceed further for the NTP tests

Checking daemon liveness...
Liveness check failed for "ntpd"
Check failed on nodes:
        node-01
PRVF-5494 : The NTP Daemon or Service was not alive on all nodes
PRVF-5415 : Check to see if NTP daemon or service is running failed
Clock synchronization check using Network Time Protocol(NTP) failed


PRVF-9652 : Cluster Time Synchronization Services check failed

Verification of Clock Synchronization across the cluster nodes was unsuccessful on all the specified nodes.


Solution:

mv  /etc/sysconfig/ntpd  /etc/sysconfig/ntpd_bk

mv /etc/ntp.conf /etc/ntp.conf_bk

Then run "cluvfy comp clocksync" in both nodes.
[grid@node-01 ~]$cd $GRID_HOME/bin
[grid@node-01 ~]$ cluvfy comp clocksync

Verifying Clock Synchronization across the cluster nodes

Checking if Clusterware is installed on all nodes...
Check of Clusterware install passed

Checking if CTSS Resource is running on all nodes...
CTSS resource check passed


Querying CTSS for time offset on all nodes...
Query of CTSS for time offset passed

Check CTSS state started...
CTSS is in Active state. Proceeding with check of clock time offsets on all nodes...
Check of clock time offsets passed


Oracle Cluster Time Synchronization Services check passed

Verification of Clock Synchronization across the cluster nodes was successful.
[grid@node-01 ~]$