Are all nodes dedicated to labbing or do you have some HomeProd services running as well?
this post was submitted on 28 Nov 2023
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I don't see why you'd want separate clusters, just stick em all in one.
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...
I see no problem putting all the machines into a single cluster. By the way, what are you using for shared storage?
TrueNAS box