Cloud solution / failover.

Hi
I have had a dedicated server running proxmox 2.6 and it has worked great. I have not upgraded it ti 3.1 since I am afraid soemthign will fail. ::

On my server I have created one node that has a server runnign using 50% of the resources so I have like 50% of resources left.. so I cna easialy create a second "dedicated server"

My question is.. how cna I make a solution with two physical serverers that has some kind of balanced/failover solution in case soem hardware goes down.

Can Proxmox automaticaly move nodes to another physical server if load are heavy ? or cna I manualy when site is live move it to other server?

Thanks for all help..

Ole