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by kinghajj
2052 days ago
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I've been looking into doing an SBC K8s cluster, but had my eyes on the ODroid N2+. Its big.LITTLE design with 4 high-performance cores and 2 low-performance ones would not only boost the compute capacity vs the RPi4, but also perhaps cgroups on the nodes could be configured such that pods only run on the 4 high-performance cores, leaving the 2 low-performance ones available for system daemons, kubelet, etc. The biggest drawback with the N2 is that it maxes out at 4GB of RAM, which might not be sufficient for the cluster master nodes. So maybe the master nodes could be 8GB RPi4s, while all the worker nodes are N2s. |
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In my experience memory is a much bigger bottleneck than CPU, net IO or disk iops.
At the moment my favorite home lab cluster is a bunch of old laptops. They're quad cores too but I've dropped 16 GB of memory in each. It's doing a lot better. Right now the cluster is using 21GB of memory.
I'm able to run everything I've wanted as well as the occasional experiment to try something out.
If I could leave you with something - get more memory than you think you will need. That's been my experience anyway.