this post was submitted on 10 Oct 2023
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Proxmox VM's hanging when one has issues (lemmy.world)
submitted 1 year ago by root@lemmy.world to c/selfhosted@lemmy.world
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I've noticed that sometimes when a particular VM/ service is having issues, they all seem to hang. For example, I have a VM hosting my DNS (pihole) and another hosting my media server (jellyfin). If Jellyfin crashes for some reason, my internet in the entire house also goes down because it seems DNS is unable to be reached for a minute or so while the Jellyfin VM recovers.

Is this expected, and is there a way to prevent it?

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[–] apigban@lemmy.dbzer0.com 4 points 1 year ago* (last edited 1 year ago) (5 children)

I'd check high I/O wait, specially if your all of the vms are on HDDs.

one of the solution I had for this issue was to have multiple DNS servers. solved it by buying a raspberry pi zero w and running a 2nd small instance of pihole there. I made sure that the piZeroW is plugged on a separate circuit in my home.

[–] root@lemmy.world 2 points 1 year ago (4 children)

Good point. I just checked and streaming something to my TV causes IO delay to spike to like 70%. I'm also wondering if maybe me routing my Jellyfin (and some other things) through NGINX (also hosted on Proxmox) has something to do with it.. Maybe I need to allocate more resources to NGINX(?)

The system running Proxmox has a couple Samsung Evo 980s in it, so I don't think they would be the issue.

[–] apigban@lemmy.dbzer0.com 1 points 1 year ago (1 children)

lemme know if you need some tshooting remotely, if schedules permit, we can do screenshares

[–] root@lemmy.world 2 points 1 year ago (1 children)

Very nice of you to offer. I made a few changes (routing my problem Jellyfin client directly to the Jellyfin server and cutting out the NGINX hop, as well as limiting the bandwidth of that client incase the line is getting saturated).

I'll try to report back if there's any updates.

[–] apigban@lemmy.dbzer0.com 1 points 1 year ago

hey yeah, no stress!

just lemme know if you'd want someone to brainstorm with.

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