Single HA Reports Server
I have a single WebLogic Server used for Oracle Reports only - 11gR2
On this server I have multiple environments; UAT - FIN - PROD
Each environment is a complete installation of WebLogic + Oracle Reports. Each installation has it's static port ini file defined to prevent any port conflicts across all the environments.
I can start / stop each environment independently and run ports in each environment simultaneously without issues .
The reports are part of .NET application so the Web Server is IIS and we installed the WLS Plug-in to proxy reports to WebLogic OHS.
Recently, I had a problem with the PROD reports server and needed to direct the applications reports calls to a different server.