This article applies as of PRTG 22
Master node and failover nodes
In a failover cluster, there is one master node and at least one failover node (there can be up to 4 failover nodes). The master node controls the configuration of the cluster. You can only change cluster settings on the master node.
Whenever the master node is not reachable, a failover node takes over the master role until the master node is back online. Such outages can occur when, for example, the server that runs the master node is restarted. The failover node(s) continue to monitor while the master node is not reachable, so gapless monitoring data is available at all times.
Note: During the outage of one cluster node, the database of the affected cluster node shows gaps because it cannot collect data during that time. There is no mechanism to fill in data from other cluster nodes. However, during the outage of one cluster node, monitoring data is still available for all other cluster nodes.
A failover master node temporarily acts as a master node
A failover node that has taken over the master role is called a failover master node. It controls the cluster until the primary master node, which is the master node by configuration, is reachable again. Usually, the primary master node becomes available again after a certain time (for example, when a server has been restarted).
Do not change settings on the failover master node
During the absence of the primary master node, you should not make changes to the configuration on the failover master node. When the primary master node is back in the cluster, the original settings stored on it are restored and deployed to the cluster. So, all changes made on the failover master node are lost.
If a primary master node fails permanently
Sometimes a server crashes and a primary master node installation cannot be restored. In this case, there is a possibility to convert a failover master node so that it becomes the new primary master node of the cluster. We recommend this procedure only in cases where you cannot restore the primary master node. For more information, see Cluster: How do I convert a (temporary) failover master node to be the primary master node?
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