Forum OpenACS Q&A: Re: Unable to install openacs-5.9.0b2
The question is, at which level of detail you want to know, what the installer does. To make this answer short: In order to start over, there is no need to touch anything in the file system (under "serverroot").
From the point of view of OpenACS, it is sufficient to drop and recreate the database (commands "dropdb" and "createdb"), you are using.
if you want to setup the full postgres installation new (which i would recommend to get the usual template0 blueprint), you can use "initdb".