== pvs ==
  PV         VG      Fmt  Attr PSize   PFree
  /dev/loop0 ceph_vg lvm2 a--  <10.00g    0 
== vgs ==
  VG      #PV #LV #SN Attr   VSize   VFree
  ceph_vg   1   1   0 wz--n- <10.00g    0 
== lvs ==
  LV      VG      Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  lv_data ceph_vg -wi-ao---- <10.00g