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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@selfhosted.forum
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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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11 comments in c/homelab@lemmy.ml view that post
[–] 7 points 3 months ago (3 children)

I'm new to this hobby and have only dipped my toes, but please tell me "out of mana" is a commonly accepted shorthand for this problem, because I love it

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  • [–] 9 points 3 months ago (2 children)

    Out Of Memory, but you can choose to believe what you like

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    • [–] 2 points 3 months ago (3 children)

    Is there a link somewhere? Maybe my reader isn't showing the link?

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  • [–] [S] 1 point 3 months ago (2 children)
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  • [–] 2 points 3 months ago (1 child)

    Was AI used to generate part or all of this tool?

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  • [–] [S] 1 point 3 months ago

    I had the bulk of the tool written myself but used AI to help tweak the final polished version. I've always been open about my AI use in the past, I have a post on my blog about the subject. AI doesn't generate my content, all ideas and opinions are my own but I do use it as a tool for refinement when needed.

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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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    [–] 1 point 3 months ago (1 child)

    It is possible to run Proxmox without using ZFS.

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