[Proxmox] VM backup with PCI passthrough

[EpicLPer]

Hi,

I tried backing up a VM with PCI passthrough but got the following error:

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Failed to perform backup: Failed to back up the disk

Veeam B&R tries to do a backup of the disk, starts transferring them, but later on stops with the above error. The console even shows data being transferred and the speed at which it did so.
Via the Proxmox Backup Server it's possible to do a backup of such VMs, as far as I know Veeam tries to create a Snapshot of the VM first which of course fails due to passthrough being enabled.

Is there any way to still back up such VMs? Or would I have to use the dedicated Veeam Agent to back those up?

Thanks!

[PTide]

Hi,

What's the device that is passed through? Is it a disk or something else?

Thanks!

[EpicLPer]

Hi, it's a GPU passed through to a Windows 11 VM.

[PTide]

Oh, ok, makes sense. We will fix that soon.

Thanks!

[EpicLPer]

Now I got an even weirder error

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kvm: -device vfio-pci,host=0000:01:00.0,id=hostpci0,bus=ich9-pcie-port-1,addr=0x0: vfio 0000:01:00.0: failed to open /dev/vfio/1: No such file or directory

[PTide]

Where do you see it? On the host, or in the job session log?

Thanks!

[EpicLPer]

That failure message was sent to me via mail after retrying 4 times, according to the Proxmox log Veeam B&R tried to restart the helper VM 4 times before failing and sending me this output log, each time with the same message above.