Upgrading Hardware

We are preparing to upgrade our Domino Server Hardware. We currently have 2 Domino Servers running in a cluster. There is no load balancing used, just redundancy in case of a failure on the primary system.

I am looking for suggestions from anyone who has done this. I know there are a few ways to go about the upgrade, and I’m interested in hearing some of your personal experiences that might assist me in avoiding problems when we upgrade.

Thanks for any responses.