My blog is to share day-to-day activities of a system administrator on engineered systems. It does not represent or endorse the accuracy or reliability of any information's, content or advertisements contained on, distributed through or linked. Information is gathered from multiple sources and is not from previous/current employers official documents. I will not be liable for any losses, damages on use of this information. Please use at your own risk.
Wednesday, October 19, 2016
Cluster Time Synchronization Service (CTSS) on RAC
Cluster Time Synchronization Service (CTSS) is installed as part of Oracle clusterware.
Basically it runs in two modes,
Time synchronization service works with NTP, then CTSS must be in Observer mode.
CRS-4700: The Cluster Time Synchronization Service is in Observer mode.
When CTSS detects time sychronization service or configuration is broken on the system, then CTSS is in 'Active' mode.
In order to change CTSS from observer to active mode, cluster needs to be stopped. Once cluster is stopped in all nodes, stop ntp service and deconfigure the service.
Once cluster is started, CTSS will be active. CRS-4701: The Cluster Time Synchronization Service is in Active mode.