Vocera Messaging Platform Failover

The Vocera Messaging Platform is designed to support clustered environments using active server and passive server configuration.

In a clustered environment, the primary server:

• Routes system traffic.
• Responds to the load balancer acknowledgment request every ten seconds.
• Updates the SQL server timestamp every two seconds.

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.