PostgreSQL Scalable ?

Hi,

One other small question ... Does PostgreSQL is scalable ?
I mean ... is it possible to have two servers, one rack of disks connected to
the 2 servers to get access in same time to the same database ?

Other point is there any possibilties to make servers clusters with PostgreSQL
? If no why ? If yes how ? ;o)

To be clear I would like to make a system with PostgreSQL able to answer about
70 000 000 requests by day (Internet services) ... I'm not sure about the
server configuration I have to make.

Thanks per advance for your answers.

Regards,
--
Hervé Piedvache

Elma Ingénierie Informatique
6 rue du Faubourg Saint-Honoré
F-75008 - Paris - France
Pho. 33-144949901
Fax. 33-144949902