[root@an-node01 ~]# pvscan
  PV /dev/drbd_an2_1      VG drbd_an2_vg1   lvm2 [93.14 GB / 93.14 GB free]
  PV /dev/drbd_an1_1      VG drbd_an1_vg1   lvm2 [12.00 MB / 12.00 MB free]
  PV /dev/drbd_shared_1   VG drbd_sh1_vg1   lvm2 [9.32 GB / 9.32 GB free]
  Total: 3 [102.47 GB] / in use: 3 [102.47 GB] / in no VG: 0 [0   ]
[root@an-node01 ~]# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "drbd_an2_vg1" using metadata type lvm2
  Found volume group "drbd_an1_vg1" using metadata type lvm2
  Found volume group "drbd_sh1_vg1" using metadata type lvm2
[root@an-node01 ~]# lvscan
[root@an-node01 ~]# lvcreate -L 9G -n test drbd_sh1_vg1
  /dev/drbd_sh1_vg1/test: not found: device not cleared
  Aborting. Failed to wipe start of new LV.