High availability clusters can stretch across long distances, such as nodes across buildings, cities or even continents. The goal of HA clusters is to support enterprise business continuity by providing location-independent load balancing and failover.

In high availability (HA) mode, two syslog-ng Store Box (SSB) units (called master and slave nodes) with identical configuration are operating simultaneously. The master shares all data with the slave node, and if the master node stops functioning, the other one becomes immediately active, so the servers are continuously accessible.

You can find more information on managing a high availability SSB cluster in Managing a high availability SSB cluster.