| LVREDUCE(8) | System Manager's Manual | LVREDUCE(8) | 
lvreduce - reduce the size of a logical volume
lvreduce [-A|--autobackup y|n] [-d|--debug] [-f|--force] [-h|-?|--help]
  {-l|--extents [-]LogicalExtentsNumber[%{VG|LV|FREE}] | -L|--size
  [-]LogicalVolumeSize[kKmMgGtT]} [-t|--test] [-v|--verbose] LogicalVolume[Path]
lvreduce allows you to reduce the size of a logical volume. Be careful when
  reducing a logical volume's size, because data in the reduced part is lost!!!
You should therefore ensure that any filesystem on the volume is resized
  before running lvreduce so that the extents that are to be removed are
  not in use.
Shrinking snapshot logical volumes (see lvcreate(8) for information to
  create snapshots) is supported as well. But to change the number of copies in
  a mirrored logical volume use lvconvert (8).
Sizes will be rounded if necessary - for example, the volume size must be an
  exact number of extents and the size of a striped segment must be a multiple
  of the number of stripes.
See lvm for common options.
  - -f, --force
- Force size reduction without any question.
- -l, --extents [-]LogicalExtentsNumber[%{VG|LV|FREE}]
- Reduce or set the logical volume size in units of logical extents. With
      the - sign the value will be subtracted from the logical volume's actual
      size and without it the will be taken as an absolute size. The number can
      also be expressed as a percentage of the total space in the Volume Group
      with the suffix %VG or relative to the existing size of the Logical Volume
      with the suffix %LV or as a percentage of the remaining free space in the
      Volume Group with the suffix %FREE.
- -L, --size [-]LogicalVolumeSize[kKmMgGtTpPeE]
- Reduce or set the logical volume size in units of megabyte by default. A
      size suffix of k for kilobyte, m for megabyte, g for gigabytes, t for
      terabytes, p for petabytes or e for exabytes is optional. With the - sign
      the value will be subtracted from the logical volume's actual size and
      without it it will be taken as an absolute size.
"lvreduce -l -3 vg00/lvol1" reduces the size of logical volume lvol1
  in volume group vg00 by 3 logical extents.
lvchange(8), lvconvert(8), lvcreate(8), lvextend(8),
  lvm(8), lvresize(8), vgreduce(8)