Horizontal scaling of JSF 2.0 application

Question

Given that JavaServer Faces is inherently stateful on the server side, what methods are recommended for horizontally scaling a JSF 2.0 application?

If an application run

Answer 1

What about session replication with "buddy" semantics?

With one buddy total memory is halved (every server needs to hold the session data of two servers), which is a lot better than having to hold data of each and every server out there.

Buddy replication also reduces bandwidth overhead.