I wanted to use lvm on top of drbd devices so that i can add more disks as drbd resources and integrate them in a vg. pvcreate /dev/drbd0 will work ok, but if you use vgcreate yourvol /dev/drbd0 it will complaint about duplicate pv. So how to use drbd devices with LVM. Solution seems to use a filter option in /etc/lvm/lvm.conf to ignore real devices and use only drbd devices . More informations on the drbd mailing list archive