Very informative. Thank you.

I do have a question. I am planning to upgrade a two-node cluster from SQL 2008 to SQL 2008 R2.

My plan was to tear upgrade the passive node, failover, upgrade the 2nd node. I have not come across the problem you described, but I am assuming that there would be certain pitfalls to my approach. Have you had any experience with a similar situation?

Thanks!!