When you add new nodes with a higher operating system to your Windows Failover cluster environment, you will receive warnings about "Functional Level" mismatch in your failover cluster logs.
The main reason for these warnings is that the operating systems and functional levels of the clusters connected to the nodes in your environment are different from each other.
You can follow the steps below to change the functional level compatibility;
- To view the Failover Cluster Functional Level version
Get-Cluster | select ClusterFunctionalLevel
- To upgrade the Failover Cluster Functional Level version
Update-ClusterFunctionalLevel
- To view the upgrade process of the Failover Cluster Functional Level version
Get-Cluster | select ClusterFunctionalLevel
- In Windows Server 2019 the Clustering team introduced a new PowerShell cmdlet to check how many nodes of the cluster are running on which level
"Get-ClusterNodeSupportedVersion"helps you to identify the Cluster Functional Level and the Cluster Upgrade Version.
The table below shows the values and each corresponding functional level:
For more detailed information;
- Cluster Operating System Rolling Upgrade
- In-Place Upgrade Windows Server 2016 to Windows Server 2019
- Failover Cluster In-Place Upgrade Tip & Trick
- Failover Cluster Node Quarantine Fix
Have a nice day!
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