Installation und Upgrade > Aktualisierungshandbuch > Before Upgrading > Unsupported Scenarios > Windows Server Failover Clustering (WSFC) with SQL Server
  
Windows Server Failover Clustering (WSFC) with SQL Server
Upgrading a system that is configured to use Microsoft Windows Server Failover Clustering (WSFC) with SQL Server is not supported. In order to upgrade your solution, you must first deconfigure the cluster. After the upgrade is completed, you can reconfigure the cluster.