In the example below, the VM ID is always 100; change it as needed.

File Format Conversion

• Use qemu-img to convert virtual disk files in other formats to qcow2
• For example, the following converts vmdk to qcow2

qemu-img convert -f vmdk /mnt/usb/windows-server/windows-server.vmdk -O qcow2 /var/lib/vz/images/100/windows-server.qcow2

Add a Virtual Disk

• First add a local virtual disk in the web UI, for example the system may automatically generate vm-100-disk-0.qcow2

qcow2 File Handling

Copy this image to /var/lib/vz/images/100/

Edit the VM Configuration File

vim /etc/pve/qemu-server/100.conf

Find vm-100-disk-0.qcow2 and replace it with the filename you actually need.

Delete the Empty Virtual Disk

• Manually enter /var/lib/vz/images/100/ and delete the empty virtual disk file created in step 1, vm-100-disk-0.qcow2

cd /var/lib/vz/images/100/
rm vm-100-disk-0.qcow2

References QEMU-IMG Migration of servers to Proxmox VE