Wednesday, June 9, 2010

Load Balancing Exchange with Barracuda

Barracuda recently put out a whitepaper on how to load balance Exchange 2010:


There is a key piece missing from this document - if you want to do "Layer 7 - HTTP" load balancing with "HTTP Cookie" persistence (Microsoft's recommendation for OWA), you need to select SSL Offloading and configure your nodes to use port 80.

Otherwise, you will need to use TCP or TCP Proxy (depending on whether you're in a 1-arm or 2-arm configuration) for all services including OWA.