pfSense on Proxmox: change disk from vritio block to scsi problem

[Urbaman75]

Hi,

I have two pfsense instances on proxmox.
I initially installed them on virtio block hdds, then tried to switch the disks to virt scsi from the vm conf, to make use of some features (cache, ssd emulation, ...).
After the switch, the machines booted fine, but I can't seem to run fdisk:
"fdisk: mounted root fs resource doesn't match expectations (regexec returned 1)".

Is there a simple way to fix it, leaving it in scsi mode and without destroying the disks/reinstalling (they are the root disks).

Thank you very much,

[Urbaman75]

Actually solved using gpart instead of fdisk (this way I can see and manage the disks).

Thank you.