VG      #PV #LV #SN Attr   VSize   VFree
  ceph_vg   1   3   0 wz--n- <14.00g 3.09g
  PV         VG      Fmt  Attr PSize   PFree
  /dev/loop4 ceph_vg lvm2 a--  <14.00g 3.09g
  LV           VG      Attr       LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  ceph_lv_data ceph_vg -wi-a----- 7.97g                                                    
  ceph_lv_db   ceph_vg -wi-a----- 1.46g                                                    
  ceph_lv_wal  ceph_vg -wi-a----- 1.46g