Windows 2012 has a new tool for this : Cluster Aware Update Wizard. It is not a WSUS replacement.
How does it work well like this. You do not have to install any role or feature to use this.
Just start the CAU ( Cluster Aware Update Wizard ) no not COW
Or do this of a cluster, yes it can be clicked but it won’t work you can’t patch the server that you are running the CAUW . so use a management server. start the tool and connect to the cluster the Tool looks in the AD or netbios and off you go
Check my fresh installed windows 8 cluster and see if there are updates needed and sure there are two updates ready to install.
First I do a check / report what updates the nodes needed.
Now I do the update nodes and the wizard goes and ask me all kind of stuff but I can do only next.
Now that the wizard is ready It starts to update the nodes you can follow the update progress in the log view screen. I have one failure ( just for testing)
After the Reboot the cluster is ready and up again no problemos.