[Pacemaker] Web farm question

[Robert Parsons]

We are building a new web farm to replace our 7 year old system. The old 
system used ipvs/ldirectord/heartbeat to implement redundant load 
balancers. All web server nodes were physical boxes.

The proposed new system will utilize approximately 24 virtual machines 
as web servers. Load balancing and redundancy will be done via ClusterIP 
rather than an explicit load balancer. We're looking at potentially 50 
services running on 24 nodes. Pacemaker seemed like it would accommodate 
such a setup, however, from my research I am worried that perhaps it 
will not scale up to such a level.

Does anyone have any experience or feedback on this proposed approach to 
a web farm? Should I consider another approach?

Thanks for any info.

- Rob Parsons