Validate Mediation server1
On one of server, go to directory /opt/dorado/oware/jboss-5.1 /server/oware/log, open a shell, type /etc/.dsienv (or oware in Windows), and then type tail -f server.log.
Observe when one other member goes down/up by unplug/re-plug the machine cable or (disable/re-enable network connection).
You can also observe medserver status within the Mediation panel in Control Panel. When a mediation server goes down you should see its severity turns to Critical.