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I have a feeling it was due to a power outage and the BIOS went to default settings... I know it shouldn't do that, but perhaps it is time to replace the CMOS battery! Now I have to retrace my steps and see what changes I made to the system as one of the VMs is powering up but the screen is...

OMG! This is embarrassing.. It turned out that VT-d was disabled afterall. In my BIOS I have 2 settings, VT-d and Intel Virtualization. I enabled them both, and now the VMs start.

The last time the VMs worked was on the 5th of December. Here is a snippet from /var/log/syslog: Dec 5 17:14:54 pve kernel: [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.15.64-1-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on pcie_acs_override=downstream,multifunction v...

Thank you leesteken. VT-d is for sure enabled. The output of cat /proc/cmdline is: BOOT_IMAGE=/boot/vmlinuz-5.15.74-1-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on iommu=pt And the output of efibootmgr -v is: BootCurrent: 0000 Timeout: 1 seconds BootOrder...

Oh, and when I run this command find /sys/kernel/iommu_groups/ -type l, I get nothing.

I have 2 VMs with PCI Passthrough and were working fine before the update. Now they won't start and I get the following error: TASK ERROR: cannot prepare PCI pass-through, IOMMU not present When I start the VM from command line, I get the following message: cannot prepare PCI pass-through...

You are a life saviour! I did vgscan first, my volumes showed up. Then I did vgchange -a y, and i was able to reach /dev/pve/root. Now I have fixed my service and all VMs booted normally. I will upgrade proxmox ASAP as well, thank you for the reminder. Once again, thank you so much!

Thank you Fabian for your reply. Very much appreciated. The problem is that I cannot get to command prompt on the server to perform the steps above. I have the same USB I used to install this instance of proxmox, and if I choose to install with debug, I can get into the command prompt of the...

Dear All, I have done a very stupid mistake which resulted in my proxmox shutting down before any VM loads. I'll explain how... I have 2 VMs set to auto start. I created a systemd service to check when both VMs are stopped to shutdown the proxmox server. The problem is that I didn't add a...