Article ID: 935197 - View products that this article applies to.
When you try to perform one of the following server operating system upgrades, the upgrade is blocked:
You must make the following changes before upgrading Windows
Uninstall the following Windows components and features:
Server Clustering - Please read Microsoft Knowledge Base article: 935197
This behavior occurs because the server is a cluster member. Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2 do not support an upgrade of clustered servers from previous versions. This is because of incompatibilities between the cluster versions.
To work around this behavior, use one of the following methods, as appropriate for your situation.
Method 1: Clean installation
Method 2: In-place migrationTo perform in-place migration, go to the following Microsoft website for more information:
Migrating to a Failover Cluster Running Windows Server 2008 R2
The Help files for Windows Server 2008 and later versions contain more information about supported paths from previous versions of clustered servers.
Article ID: 935197 - Last Review: August 22, 2013 - Revision: 5.0