upgrading 2008 cluster to r2

what is the best approach to increment the version of sql from r1 to r2 in a cluster.

is it possible to do a in place upgrade without totally taking down the cluster.

we are talking about a active active passive cluster.
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Metehan OzculluSQL Service ManagerCommented:
yes it is . you should first upgrade the passive node and failover the resources to that instance and afterwards upgrade the remaining node(s) I have tried in my lab env. and it worked fine. Also there is an MS Article:

25112Author Commented:
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