Hi,
If a failover (backup) agent has been down for a few weeks, is there something one need to take into consideration before bringing it back up again? Will the backup agent receive all necessary data from the main agent when the backup agent comes back online again and sync connection is established again?
Running DataMiner 10.5 with a self-hosted Cassandra/OpenSearch cluster.
Second question: Does the backup agent communicate with the Cassandra cluster or is it just the main servers that does ?
Maybe i should clarify my question about the backup (offline mode) server communicating with Cassandra:
Does an agent that currently have the role as backup (offline mode) ever communicate with the Cassandra cluster or is it just the agent currently acting as Main agent that read and write?. I'm thinking that if an agent currently act as backup, it is passive until a failover switch.
Hello Roger,
The backup agent does communicate with the Cassandra cluster but there is no data getting through the 'offline' agent. The primary(online) agent is the one that sends and receives data. From the secondary(offline) agent must have a communication channel open towards the Cassandra cluster but there should not be anything going through it, when you perform a failover switch, the 'secondary' agent starts utilizing the connection to receive and pass data along to the Cassandra database, while the 'primary' agent stops sending and receiving data, but keeps the communication open