Lately, there have been lots of questions around placing more than one RODC in the same site for load balancing and disaster recovery purposes.  We, the AD UA team, recently published an article, Placing Several RODCs in the Same Site (http://technet.microsoft.com/en-us/library/ee522995(WS.10).aspx). 

Hopefully, this document should  clear up the confusion that some of our customers have around this issue.  We look forward to your feedback.  Please use the comment tool (on the TechNet page) to rate and provide feedback for this topic.

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