But the biggest problem you will run into is performance. Terminal Services (Application Mode) is a huge resource hog. The same is true for a very busy SQL Server. If your SQL Server activity is low, and your Terminal Services sessions are few, then they might be able to co-exist together, but I still would shy away from it because of the added complexity of putting both on the same cluster. Clusters still are a little tricky to set up and manage, and adding Terminal Services and SQL Server into the mix at the same time is just asking for trouble.
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