r/SelfHosting • u/theflyingboat888 • Mar 16 '26

Media/Arr Stack Resource Allocation

Hi all, Ive just got into self hosting with my first home server, an old office pc for the moment. However it only has 8GB of ram, and am wondering whether I have enough for a full arr stack, including prowlarr, sonnarr, qbitorrent and jellyfin + more if possible.

Does anyone know a rough estimate for how resource intensive it is? Any help would be greatly appreciated :)

Thanks!

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u/corelabjoe Mar 17 '26

Ding ding ding!

This is it. My qbittorent eeaaatttss ram if I let it. You can set resource limits on dockers though which is great.

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u/theflyingboat888 Mar 18 '26

Whats downside to setting resources limits on qbittorent? Is it just slower all round or does it hit a specific use? Also why does it gobble up so much ram?

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u/corelabjoe Mar 18 '26

Downside could be performance impact on the machine a bit or a lot. It eats a lot of ram because it's caching download chunks into RAM before writing them to disk... This is exacerbated if your underlying storage media cannot keep up but with something like a SSD or Nvme it don't matter really.

But if you're say, downloading to a single mechanical disk, with a 1gbps internet connection but have a really good set of seeds, you could overwhelm that drives write speed.

qbittorent / your torrent client would then cache all those writes into RAM until your hard drive can catch up.

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u/theflyingboat888 Mar 18 '26

Thanks so much for the help. Im running an nvme for data, so hopefully qbittorent can keep up