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Can you mix Windows Server 2012 and Server 2012 R2 in a cluster?
Mix operating systems in a cluster? No!
John Savill
December 6, 2013
1 Min Read
Q: Can I create a cluster with a mix of Windows Server 2012 and Windows Server 2012 R2 hosts?
A: No. You can't mix OS versions in a cluster. It will fail validation and also will fail to create the cluster. All OSs in a cluster must be the same version.
This is why a rolling upgrade of a cluster isn't possible.
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