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.