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You can cluster IDOL Site Admin for high availability. For more information on how to configure this feature, refer to the Apache Tomcat Clustering/Session Replication documentation.
After you have clustered the Tomcat application servers, you should use a load balancer to route traffic to the clustered back ends. If you are running IDOL Site Admin on Ubuntu Linux, HPE recommends that you use HAProxy with Keepalived to maintain an active-passive load balancer configuration.