Just a quick recap on the cluster sheets this week, there were a lot of questions how do I solve the split brain thing.
Well make sure you have one cluster node up and do start the services with force state like below
net start clussvc /fixquorum
Or with powershell
So just now there is new documentation discussing special cases and consideration when migration to a R2 cluster (from 2003, 2008 or R2). Additional considerations needed for DFS-Replication, DHCP, (MS)DTC, Exchange, File Server, MSMQ, Print, SQL, VMs and 3rd Party
Resources. Link: http://technet.microsoft.com/en-us/library/ee791924(WS.10).aspx Our general R2 migration guide is here: http://technet.microsoft.com/en-us/library/cc730990.aspx
Additional detailed guidance for the following migrations on a cluster is also available:
Steps for migrating from R2 RC to R2 RTM are here: http://blogs.msdn.com/clustering/archive/2009/09/02/9890272.aspx