Commands such as 'lvextend' fail with 'Insufficient free space' errors, despite the VG containing enough free space for the operation.

Issue

• When creating or extending an LV, the operation fails with Insufficient free space errors, even though the VG and its PVs report a VFree value that should be large enough for the operation:

# pvs
  PV        VG       Fmt   Attr  PSize    PFree
  /dev/sdX  VG_NAME  lvm2  u--    4.00t  512.00g

# vgs
  VG           #PV #LV #SN Attr   VSize    VFree
  VG_NAME        1   1   0 wz--n-    4.00t  512.00g

# lvextend -L +500G /dev/VG_NAME/LV_NAME -r
  Insufficient free space: 128000 extents needed, but only 0 available

• The error is logged even if the logical volume is a basic linear volume, or when there are enough available PVs in the volume group to properly extend a striped logical volume.