We need to update the NTP settings on some servers.
The DataMiner servers are running Cassandra and ElasticSearch but we also have additional ElasticSearch Windows servers to form 2 ElasticSearch clusters with each 3 nodes.
My idea is to stop DataMiner on the 2 DataMiner servers first.
Is it safe to after that stop the Cassandra and ElasticSearch services from the Services in Windows?
Or is there a specific procedure to safely stop these services?
Having a synchronized clock in your environment is indeed important. This is not only important for your DataMiner cluster, but also for your database clusters.
But, to be honest I've never considered shutting down the DataMiner and database services for a time change. If the time reported by the time server does not change (drastically), from what it was connected to in the past, I don't see the need in stopping all the DataMiner and database nodes. This is a similar thing as we see when the clock on the DMA changes due to daylight-saving time changes.
If there would be a significant time change, your suggestion is correct:
(1) shut down the DataMiner nodes
(2) shut down the Cassandra and elastic services of all cluster nodes
(3) do your changes
(4) start your databases
(5) start your DataMiner
correct Jeroen
thanks Jan. And stopping databases from the Services in Windows is sufficient?
There’s no special commands to be executed?