My primary question here is should I keep the models seperated and make a secondary cluster, or group them all together? Or is there an even better option in my situation?
I'm sure it isn't all too important but I still would like some opinions.
One thing to keep in mind with clusters is quorum. You need "half the nodes +1" up and running for the cluster to operate normally. Having isolated servers circumvents this.
I ran into this when I built a test cluster with 5 nodes. Found out I needed at least 3 nodes powered on to do anything. I now have a 2 node cluster (with my laptop running a qdevice for quorum) and 2 isolated nodes. Translates into some decent power savings...