I am running a website right now on one mongrel. Things are going well at present, but of course I expect the site to grow and need to know when, how, and perhaps IF i need to add mongrel clusters. Isn't adding mongrel clusters the way to scale a RoR website? Is there another way that I don't know about?
You may wanna take a look at mod_rails (http://www.modrails.com/), much easier to configure and the performance appears to be as good or better for most apps.
It's never too soon to move to a high performance app server;-)
