Hello,
We have a 2-node cluster both Windows 2012 servers.
We now want to add a third node, but this one is 2012R2.
Cluster validation fails because the apparently can't work together.
How can we add our third node to the cluster without downtime?
As far as I can see, the only option to do this, is to reinstall the third node with windows 2012.
But I can't imagine that that's the only option.