How dbconsole is deployed on RAC database having multiple instances?
In 10.2.x.x DB Control on a RAC cluster with n nodes, a dbconsole is installed only on the node from which the DB Control is deployed. One agent on each node is deployed to reports to that same unique dbconsole management service. It is however possible to later reconfigure the DB Control to have more than one dbconsole started and to have agents reporting to several dbconsole. In 10.1.x.x a dbconsole is deployed on each node of the cluster. Each agent on each node reported to each dbconsole management service on the same node.