What is Cluster Aware Updating in Windows Server 2012?
http://blogs.technet.com/b/mspfe/archive/2013/02/06/what-is-cluster-aware-updating-in-windows-server-2012.aspx
http://blogs.technet.com/b/mspfe/archive/2013/03/07/what-is-cluster-aware-updating-in-windows-server-2012-part-2-video.aspx
http://www.windowsnetworking.com/articles-tutorials/windows-server-2012/cluster-aware-updating-windows-server-2012-r2-part2.html
(Before we to operate you need to check the cluster health)
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