Informatica recommends that you install and deploy the MDM Hub on standalone application server instances. To achieve high availability, you can use external load balancers for real time API calls. To scale the MDM Hub implementation, you can add standalone application server instances and deploy additional MDM Hub components. You can achieve load balancing for batch jobs through the internal mechanism of the MDM Hub.

If you install and deploy the MDM Hub in application server clusters, sessions do not replicate or fail over to other nodes in the cluster. You can use SIF APIs or the Hub Console to run the MDM Hub batch jobs, but the batch jobs do not fail over because the sessions do not replicate. However, if a batch job request is through the Hub Console, the request and not the batch job fails over to the active nodes in the cluster. Also, if an application server node fails, the Informatica Data Director (IDD) session is lost and does not replicate.