A few cluster questions!

Hi!

I am really interested in Interworx and I am wondering a bit about clustering, I am going to get a dedicated server to install Interworx on and I will start transferring accounts over from cPanel. At some point when one server will not be enough to host all my sites, is it then possible to add more machines and create the cluster using the existing data?

How would a cluster look like?

Thanks in advance,
Best Regards
Fidde