OpenSSO Enterprise 8.0 

Two or more OpenSSO Enterprise instances must be running on different host servers and configured as a site behind a load balancer. 

The load balancer does not have any specific requirements. However, a load balancer that supports cookie-based sticky configuration usually provides better performance. 

Sun Java System Message Queue 4.1 

Message Queue brokers must be running in cluster mode on different servers. 

Oracle Berkeley DB 4.6.18 

The Berkeley DB client and database must be deployed on the same servers as the Message Queue brokers. 

You can deploy the Message Queue brokers and Berkeley DB on the same servers that are running the OpenSSO Enterprise instances. However, for improved performance, consider installing the brokers on different servers.