Currently we have 2 different groups using apps on 2 servers. We are considering setting up a cluster. The advantage is obvious - whenever one server goes down the other picks up so users aren't completely out of luck.
In the past we didn't do this because we were afraid of the added memory overhead associated with running both sets of QV apps on both servers. I have heard that this is no longer the case since you can set the apps up so that by default it runs on one box rather than either.
I am looking forward to maintaining only one set of named users. Are their any other considerations I'm missing? Any big downsides? Also is there a document on the partner website that would go over the configuration issues such as mentioned above I should review?
You can run the Cluster and set for each document where it should be available and make sure with preload ensure that the document is loaded on a specific node as long both nodes are running. If one goes done, the app will also be loaded on the second one.
In this case you have on License Management for the Cluster. This is a common way to run a cluster.