WSUS 3.0 Server in Windows Server 2008 SP2

First of all if no objection if a node has more patches than another. The nodes of the cluster should be identical in all files, because when you pass the application or resource from one to another should start without problems as if they were the same files. In the case of OS is the same must have the same patch level. How to proceed? Usually spend the application or use one of the nodes, in this case, B, update the node A and restart it, when you start the application or application pass to node and check it all. If all goes well then update the node B at the same level and restart. When you start again you spend the use of B to make sure everything is ok. I hope to serve you, any questions let me know.

WSUS 3.0 Server in Windows Server 2008 SP2