this post was submitted on 14 Mar 2025
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Transfer speed issues on new Proxomox 8.3 setup (lemm.ee)
submitted 1 day ago* (last edited 1 day ago) by CmdrShepard42@lemm.ee to c/selfhosted@lemmy.world
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I recently posted about upgrading my media server and migrating off Windows to Proxmox. I've been following an excellent guide from TechHut on YouTube but have run into issues migrating my media into the new Proxmox setup.

Both my old Windows machine and new Proxmox host have 2.5Gb NIC cards and are connected together with a 2.5Gb switch and running on the same subnet. Following the guide, I've created a ZFS pool with 7x14TB drives and created an Ubuntu LXC which is running Cockpit to create Samba shares.

When transferring files from Windows, I'm only seeing 100MB/s speeds on the initial transfer and every other transfer after that caps out at >10MB/s until I reboot the Cockpit container and the cycle completes.

I'm not very knowledgeable on Proxmox or Linux but have run an iperf3 test between Windows > Proxmox and Windows > Cockpit container and both show roughly 2.5Gb transfer speeds yet I am still limited when transferring files.

Googling the issue brings up some troubleshooting steps but I don't understand a lot of it. One fix was to disable IPv6 in Proxmox (I dont have this setup on my network), which was successful, but didn't fix anything. I no longer see the interface when doing an 'ip a' command in Proxmox, though I do still see it when doing it in the SMB container.

Does anybody have any experience with this that can offer a solution or path toward finding a solution? I have roughly 40TB of media to transfer and 8MB/s isn't going to cut it.

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[–] tenchiken@lemmy.dbzer0.com 1 points 18 hours ago (1 children)

Awesome, so that's good news. Disks probably just fine.

My next thoughts are on the service itself then... Your service providing the share might be getting throttled or not getting direct access to kernel hooks for performance.

Simplest test I would think is set up Samba or NFS in the host itself, not a container. Try a large transfer there. If speed isn't an issue that way, then something at the container level is hindering you.

[–] CmdrShepard42@lemm.ee 2 points 16 hours ago

I suspect it is something wrong or misconfigured in the container because I can reliably reproduce this issue by doing one transfer and getting 100MB/s and always on the second (or additional) transfer getting 10MB/s until I restart the container.