The Vocera Messaging Platform is designed to support clustered environments using active server and passive server configuration.
In a clustered environment, the primary server:
Secondary nodes retrieve a timestamp from the SQL server every two seconds, but stay passive unless the primary node fails. The load balancer manages the status of each VMP Server by sending a health check request to the primary and secondary nodes. The load balancer redirects traffic to a secondary node after a third missed heartbeat from the primary node.