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HP EliteDesk 800 G4 Mini: Random Hard Resets. How to fix?

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QuestionAsker

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Got a HP EliteDesk 800 G4 Mini as my first homelab, running Proxmox VE, with one VM to run my services.

However I’m getting random hard resets every 1-2 days, causing my services to go offline, and having to manually restart the VM.

No kernel panic, OOM, or I/O errors. Just showing “crash” when I run last reboot .

Specs:
  1. HP EliteDesk 800 G4 Mini
  2. i7-8700T
  3. 64GB RAM (2x32GB Samsung DDR4 2666 SODIMM, non-ECC)
  4. NVMe 1: SK Hynix PC611 256GB (OS)
  5. NVMe 2: Samsung 990 PRO 1TB (firmware 5B2QJXD7)
  6. ZFS on root
  7. 90W OEM HP power brick
Running:
  1. Proxmox VE (Debian trixie base)
  2. Debian VM running:
    • WireGuard
    • Gitea (Docker + Postgres)
    • Joplin Server
  3. Light homelab services, nothing crazy load-wise


So far, have confirmed:
  • No OOM events
  • No kernel panic logs
  • No MCE / hardware error logs
  • NVMe SMART clean (0 media errors, no critical warnings)
  • Temps normal
  • ZFS ARC tiny (~250MB)
  • unsafe_shutdowns incrementing on NVMe (suggesting abrupt power loss(?))

It looks like a hard power-level reset (Logs just stop)

Power brick is 90W OEM HP (19.5V 4.62A).



I’m about to run memtest overnight to rule out RAM.

Has anyone run 64GB in this model long-term and seen similar instability?
Is 90W borderline once you’re running 64GB + 2x NVMe + ZFS + VMs?

Anything else I should be checking before I replace the power adapter?

Wondering if anyone else has issues running these Minis as hypervisors.
 
How sure are you that the power's clean? Is there a different cct you can plug it into? Do you have access to a UPS w/ line conditioning you can try to plug it into?
 
Proxmox can be a PITA from my own experience. I too had disable C-State but it wasn't the cause of my problem.

forum.proxmox.com

Proxmox Mystery Random Reboots

I've had a Proxmox install running rock solid for months and all of a sudden it's randomly rebooting. It can run for 5 minutes or 5 hours. The weird thing is, I've basically u sed up all of the collective posts on the subject and still can't track it down. I'm now at the point where I really...
forum.proxmox.com forum.proxmox.com
 
QuestionAsker said:
I’m about to run memtest overnight to rule out RAM.

Has anyone run 64GB in this model long-term and seen similar instability?
Is 90W borderline once you’re running 64GB + 2x NVMe + ZFS + VMs?

Anything else I should be checking before I replace the power adapter?

Wondering if anyone else has issues running these Minis as hypervisors.
Click to expand...
If it is anything like the Lenovo Tiny's then yes, the 90W brick might be the issue, once you add h/w to the mini's they can seem unstable. i.e., 135W lenovo P320 tiny with similar specs was fine with a single stick of ram and a single NVMe but upgrade the RAM to 64GB and add an NVMe it seemed to chug and sputter, upgraded the power brick to 170W and voila performance issues disappeared. I know this sounds anecdotal, however, I went through very similar issues you are describing, the only difference in specs was my P320 has an nVidia P600 in the mix. Can't remember what the forum was, might have been the old Lenovo forums, and one of the admins recommended an uprated power supply which solved the issue.

EDIT- If you are in the Calgary area, I have a 150W HP PSU you can have and see if it fixes your instability/crash issues, no charge.
 
This isn't likely your problem but your setup seems strange. The flexibility of proxmox should be using lxcs where possible instead of vms due to the decreased overhead. Then it's kinda weird to have something with high virtualization to them shove unrelated things onto a single vms especially when the community helper scripts would have configured them for you in moments as separate lxcs.

More on topic is poke in the bios see if you can put the CPU in a lower performance mode for a couple days. See if it has any effect.
 
As suggested, my 2 cents on the RAM or the PSU.

You may have a faulty chip on the second ram stick, and it only get written after 2 days, resulting in a crash (got that situation on a laptop and a desktop in the last 20 years).

Memtest will flag it.

Could be also a dual channel problem with 2x32gb sticks. It's a stupid situation, were it could be stable with only 1 stick, not 2.

If memory is clear of defect, another PSU may do the trick.
 
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