We have a 2012 Datacenter Server in our network, we are introducing a 2012 Datacenter R2 server as well as a SAN and iscsi for clustering and high availability of Virtual servers. We are currently using Hyper-V on the 2012 DC we already have.
I've built the 2012 DC R2 server and have clustering installed, I install clustering and try to add the 2012 DC server and it does not add, in the report it tells me it is because one server is 2012 Datacenter and the other is 2012 Datacenter R2.
Our issue is this, the original server is a production server with 10 Virtuals on it right now, we would prefer to get that to R2 in order to have the latest version as well as the live migration on failover.
Our options appear to be:
1. Blow away new server, install 2012 Datacenter non-R2 and cluster.
2. Do #1, then try to upgrade each server to R2.
3. Move all virtuals from original server to the R2 server, upgrade the original to R2 and then cluster that.
What seems to be the best method? What licensing should I be concerned of? If I don't have a 2012 R2 license available we would need to buy that correct?