Sometimes you will need to use multiple drives for the LVM Thin pool.
pvcreate /dev/sdc /dev/sdd /dev/sde /dev/sdf pvs vgcreate pve /dev/sdc /dev/sdd /dev/sde /dev/sdf vgs lvcreate -T -l 100%FREE --poolmetadatasize 16G pve/data lvs