Cluster Aware Updating CAU
It is nice tool given by Microsoft for windows cluster WSFC servers.
How to configure for SQL servers.
Open CAU – Type cluster name –connect the cluster server – click Analysis cluster updating readiness.
Review the log, once all good, move on to configure.
Click configure cluster self updating – Next next. I will not suggest to go default, make some change based on your environment, like failover apply node orders etc.
Here is my configuration.