Disk Passthrough not visible in PVE

[fmaurer]

Hello everyone,
I have the issue that one can not see if a disk using a non-standard filesystem (as beegfs) is passed through to a VM.

For testing of different filesystems, we configured passthrough of a few disks to VMs in Proxmox using the guide here:
https://pve.proxmox.com/wiki/Passthrough_Physical_Disk_to_Virtual_Machine_(VM)

This shows up just fine in PVE in the VM configuration



However in the list of disks I can see this disk 2320A010TCF8 as unused:




I can even create a new file system or add this disk as OSD, which would delete its data.
In the VM it is configured as a BEEGFS disk.

Is there any way to prohibit this behavior and somehow lock disks which are already passed through?

If the passedthrough disk uses EXT4 or Ceph itself - the disk list recognizes this correctly (see nvme4n1 - which is passed through similarly) but still do not have some kind of flag that the disk is used for a passthrough currently.

Thank you!
Best regards

fmaurer

 

[fabian]

no, if you use some unknown formatting on the disk that is not recognized by the hypervisor, it cannot know that the disk is used already.. if your hardware supports it, you could try passing through the whole pci-e device instead, making the disk disappear from the host. this should also give you better performance, and allows defining a hardware mapping that is manageable using regular privileges instead of being root only