[Pacemaker] Max number of nodes in a Pacemaker/Openais cluster?

[lists at unimitated.com]

What is the general maximum number of nodes I can realistically  
support in a cluster with pacemaker and openais?  If I wanted to do  
something like 100 nodes supporting a set of resources in a reliable  
network, could I make that work or will I have a lot of problems  
keeping things up, failing, etc.?

Thanks for any insight.