What you want is some kind of huge pararell computing , isn't it? I have heard
from many groups of Japanese Pgsql developer did it but they are talking in
japanese website and of course in Japanese.
I can name one of them " Asushi Mitani" and his website
http://www.csra.co.jp/~mitani/jpug/pgcluster/en/index.html
and you may directly contact him.
Amrit
Thailand