Only two Tellaro appliances are deployed in a cluster, either in one data center or split between two, exposing the SOAP and REST web service API on port 8181 (the default Payara port where StrongKey web services are enabled).

In this depiction, the applications are only pointing to the primary data center (Tellaro 01) for FIDO2 services, which asynchronously replicates data to the other node over ports 7001, 7002, and 7003—whether it is in the same data center or over WAN. The assumption is that applications using this configuration are designed to fail over to using the second node (Tellaro 02) if the primary data center's node becomes unavailable for any reason. While commercial or open-source load balancers can provide this resiliency to applications without any failover code in the application, it becomes a matter of the application designer's choice on how they wish to handle application resiliency in the face of a complete failure of a cluster node or a data center.