Mediation Behavior and Polling
When you set up a mediation cluster to do polling, one server in the cluster does the all the polling. If the active server goes down, another resumes polling. A High Availability mediation setup duplicates the backlog of collected data that has not been posted to database in this standby server. In this case, installation requires redundant messages from devices to all servers in the cluster.
If the active mediation server goes down, you may lose one interval to re-establish starting values for computations about the changes (deltas) from previous polling.
Data replication may impact performance negatively.