I have an existing multi-instance SQL 2008 cluster, and I'm trying to add Analysis Services to an existing instance. I start the installation, pick "Add features", configure SSAS, and then on the final pre-installation check, I fail the "Existing clustered or cluster-prepared instance" check. Of course I'd fail this check - I'm trying to add a feature to an existing clustered instance. Here's a picture of the error:

[!["Existing clustered or cluster-prepared instance" error message](https://i.stack.imgur.com/Bv3Rr.gif)](https://i.stack.imgur.com/Bv3Rr.gif)  

(source: [trycatchfinally.net](http://trycatchfinally.net/UploadedImages/SQL%20-%20Existing%20Clustered%20Instance.gif)) 

Has anybody successfully added a feature to a clustered instance in SQL 2008? I can't believe it can't be done - my alternative is to remove SQL from one node, try to add the feature again, hoping I don't fail this same check (though I probably will), and then re-add to the second node. This seems dangerous and unnecessary.

I found another person who had the same question, but the people answering it clearly aren't even reading the question, since they're mentioning how to cluster a server, and that he should use SQL 2000, so this is no help at all (though I'd love to point him here once it's answered: <http://forums.techarena.in/software-development/1209984.htm>