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# generala
adamant-kite-43734
04/04/2023, 8:17 PMThis message was deleted.
c
creamy-pencil-82913
04/04/2023, 8:21 PMall of those things are going to put a ton of IO load on your underlying storage. LH and Prometheus are both quite IO intensive. Especially if you’re running 3 LH replicas against the same physical disk. I wouldn’t be surprised if you end up having reliability problems due to that.
creamy-pencil-82913
04/04/2023, 8:21 PMalso if you’re doing 3 node I would go with embedded etcd instead of mysql. the only reason to use an external sql DB is if you want to do two-node HA.
b
brash-belgium-72831
04/04/2023, 8:25 PMI've only tried Kubernetes for a week or two so everything is brand new! I saw that you can use "metrics server" or Prometheus/Grafana in OpenLens but maybe I don't even need to think about it in Rancher?
brash-belgium-72831
04/04/2023, 8:32 PMWhat i want is maybe just two node's then.. Just to be able to bring one offline if upgrades need's to be done. Nothing real crazy.
c
creamy-pencil-82913
04/04/2023, 8:34 PMgenerally you don’t take them down for upgrades… you just drop a new binary on the host and restart the service
creamy-pencil-82913
04/04/2023, 8:34 PMor use the system upgrade controller or rancher and it will do that for you
b
brash-belgium-72831
04/04/2023, 8:35 PMOh! So maybe just even a single node would work for me then.. Haha! As you can see. still learning!
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