We currently have two Dell VRTX boxes, one in production, and one not (yet). The new one is running Server 2012 R2 and the production system is running Server 2012. I have read all of the documentation on migrating the cluster to the new servers, but what I want to do is a little different. I want to upgrade the existing blade servers to R2. I'm not actually worried about migrating the VM's themselves. Does anyone know if it is possible to move the cluster roles to the new server, upgrade the existing servers to R2, then move the roles back, and start up the VM's again. The VM storage wouldn't change at all, and we would obviously be down while we are upgrading the current servers to R2. The goal is to avoid moving the terrabytes of data to a temporary location, just to move it back. It would take longer to transfer the data than install the new OS.
Any thoughts or comments would be appreciated. Thank you.