we have 2 hyper-v clusters.
The first cluster consists of 3 Microsoft windows 2012 servers , and the second one consists of 2 Microsoft windows 2012 r2.
We want to upgrade the first cluster servers to windows 2012 R2 and join them to the second cluster.
The goal is to have one unique cluster with Microsoft windows 2012 R2 without any downtime or risk.
Is it possible to do a live upgrade?? If yes how?