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LVREDUCE(8)                 System Manager's Manual                LVREDUCE(8)



NAME
       lvreduce - reduce the size of a logical volume

SYNOPSIS
       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]

DESCRIPTION
       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.

OPTIONS
       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.

Example
       "lvreduce -l -3 vg00/lvol1" reduces the size of logical volume lvol1 in
       volume group vg00 by 3 logical extents.

SEE ALSO
       lvchange(8), lvconvert(8), lvcreate(8), lvextend(8), lvm(8),
       lvresize(8), vgreduce(8)



Sistina Software UK    LVM TOOLS 2.02.44-cvs (02-17-09)            LVREDUCE(8)