CRS-4700: The Cluster Time Synchronization Service is in Observer mode.

CRS-4700: The Cluster Time Synchronization Service is in Observer mode.

or 

How to switch from NTP to CTSS?

It is recommended to use CTSS for a cluster to synchronize the time between cluster nodes instead of NTP.

We will find the CTSS status in observer mode when ntp.conf file is in /etc/.

1. Check if ctssd is active or not

cd /u01/app/11.2.0.4/grid/bin

[oracle@test_node01 ~]$ ./crsctl check ctss

CRS-4700: The Cluster Time Synchronization Service is in Observer mode.

[oracle@test_node02 ~]$ ./crsctl check ctss

CRS-4700: The Cluster Time Synchronization Service is in Observer mode.

We can see that CTSSD is in observer mode

2. Stop  NTP and CRS

now we are going to disable the ntp service and enable CTSS service

#crsctl stop crs

#/sbin/service ntpd stop

#mv /etc/ntp.conf /etc/ntp.conf.original

3. Start the cluster on all nodes

#crsctl start crs

4. Check that ctssd automatically starts in active mode as shown below

[root@test_node02 etc]# crsctl check ctss

CRS-4701: The Cluster Time Synchronization Service is in Active mode.

CRS-4702: Offset (in msec): 0

[root@test_node01 etc]# crsctl check ctss

CRS-4701: The Cluster Time Synchronization Service is in Active mode.

CRS-4702: Offset (in msec): 0

./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.