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I built a basic Proxmox overhead calculator after nearly OOMing my cluster! (unknownuniverse.uk)
submitted 3 months ago by to c/homelab@lemmy.ml
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After coming close to running out of resources last week and having to re-purpose another device turning it into a 3rd Proxmox node, it got me thinking about how easily ZFS ARC cache and VM overhead sneak up on you.

So, I built a basic tool for rough guidance.

It calculates vCPU overcommit ratios and RAM allocation locally in your browser. Just pure client-side math so you don't accidentally OOM your hypervisor like I almost did. Inputs stay right in your browser and aren't saved anywhere.

Feedback or sanity checks on the math are welcome.

https://unknownuniverse.uk/tools/proxmox-calculator/

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[–] 2 points 3 months ago

I’ve OOM my Proxmox numerous times, too expensive to upgrade, so far has corrupted my VM’s a small handful of times, shout out to fsck for bringing everything back in order.

The worst is when the LVM-Thin storage is full, trying to get into a VM that can’t boot because it has no disk space left is horrendous and I never wish that upon anyone.

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