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Sorry, if this a trivial question... If you disconnect this very cable from the PVE and connect it to some other computer with 1 Gbitps interface... Do you get 1 Gbitps?

This "PVE9 works only for 20-30 seconds" (the temporary nature of the issue) can be a symptom of an IP address conflict somewhere. Of course it doesn't have to. I would check all devices for their IP addresses. And compare their ARP tables when the communication is OK and when not OK. And check...

:)Then you are encouraged to edit the topic of the thread, that is, to change the prefix from "none" to "SOLVED". It will help future readers find the solution :) .

Glad I helped :) . I would be surprised if in fact jumbo frames can't be used in PBS interfaces. Have a look at a near thread: https://forum.proxmox.com/threads/mtu-size-requirements.172867/ Nicolas Frey wrote there: If I see it correctly, you could set MTU in ens... ifaces (or maybe in...

Welcome, doitright! I like your approach (shown also in your nick :) ). I'm not qualified enough to answer your question. I'm quite impressed how thoughtfully created is your infrastructure. The only idea which has come to my mind is whether the plan for VM backups is similarly good. Maybe...

Maybe some "energy saving" setting?... I'm shooting blindly, just saw a neighbour thread https://forum.proxmox.com/threads/network-drops-out-randomly.166414/ Edit: ... or bad network interface... I can see posts about issues with some Intel NICs. I don't know your NIC, but you may try to search...

I think we haven't got enough details from you to understand the issue. If you can't describe it, maybe post screenhots?

If the message "Connection closed by foreign host" was NOT immediately after you executed telnet, then we at least can assume the network lets the connection through OK. Another try: from the "unlucky" PVE execute proxmox-backup-client list --repository "USER@REALM@HOST:DATASTORE" What gives...

What changes in VM do you mean?

If in the "unlucky" PVE host you execute in the shell telnet 10.22.69.62 8007 - what will you get in the screen?

From the screenshot you included, it doesn't necessarily mean that "pbs is not answering pve (10.22.69.68) requests". What is in the logs in the PBS at the moment you are (unsuccessfully) trying to connect to the PBS? E.g. in journalctl, /var/log/proxmox-backup/api/access.log What are the...

I don't know what is "viewport or whatever" in PVE. Could you describe in detail what and where you are doing and what is happening after this?

As you did zfs create -o mountpoint=/xpool/vm xpool/vm then shouldn't it be # ZFS pool for VM/CT zfspool: xpool/vm pool xpool/vm or so? (I'm not sure for zfspool syntax in /etc/pve/storage.cfg).

Disclaimer: I'm not an expert and I have only done some googling. Maybe the queue length is involved. But as far as I can see in your initial post, it's already increased (qlen 10000) from what is usually set, AFAICS, 1000. Anyway, maybe this link is of some help...

Is there anything unusual in journalctl or in dmesg -T in the VM or in the host?

Hi, you are encouraged to do it yourself :) - to help future readers find the solution. By editing the title of your thread and selecting "SOLVED" as the prefix.

FWIW, I can see OpenTelemetry mentioned in the Proxmox VE 9.0 Changelog Overview at https://pve.proxmox.com/wiki/Roadmap I haven't found it mentioned in the fresh PDF of "Proxmox VE Administration Guide".

If I understand various other posts correctly, it should be "... then you lose...", not "then you use...". Or am I wrong?

01/2:00 Let's verify it: # systemd-analyze calendar --iterations=12 '01/2:00' Original form: 01/2:00 Normalized form: *-*-* 01/2:00:00 Next elapse: Sat 2025-09-27 13:00:00 CEST (in UTC): Sat 2025-09-27 11:00:00 UTC From now: 47min left Iter. #2: Sat 2025-09-27...

Not sure what you are trying to achieve. In the first screenshot we can see "Resource Pool". But are you trying to assign the VM to a resource pool? As far as I understand it's not about disks. So I guess you want to create a disk for the VM. If so, it's being done in the fourth link: "Disks"...