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.
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