thanks for the info, and i have more questions.
To reload a RoR app, currently i use capistrano to restart mongrel processes, very simple, and it won't affect other vhost. how is it done using LSAPI, disable/enable vhost, or restart whole webserver?
under which scenario would one use LSRR instead of LSAPI? I mean what LSRR attempt to accomplish that LSAPI can't do?
for my typical RoR app, I create a vhost to load balance a few mongrel processes, all in one server. If traffic grows, I think I can still use one LS vhost to load balance more mongrel processes on several servers, correct? how is scalability done using LSAPI cross several servers?