You can only have one version of PostgreSQL running on a dsview server (PostgreSQL version 9.0. 13 ).You can download the DSView™ 4 Transition Technical Bulletin. this provides you with step by step instructions..
The Avocent installer will take care of all the start/stop scripts.
You should be able to see the postgres and DSView processes running, (ps -ef !grep DSView*) then DSView should start. if you still have issues please call Avocent technical support .