NAME
       lvreduce - reduce the size of a logical volume

SYNOPSIS
       lvreduce [-A|--autobackup y|n] [-d|--debug] [-f|--force] [-h|-?|--help]
       [--noudevsync] {-l|--extents  [-]LogicalExtentsNumber[%{VG|LV|FREE|ORI-
       GIN}] | -L|--size [-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]} [-n|--nofsck]
       [-r|--resizefs] [-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 prompting even when  it  may  cause
              data loss.

       --noudevsync
              Disable  udev  synchronisation.  The  process  will not wait for
              notification from udev.  It will continue  irrespective  of  any
              possible udev processing in the background.  You should only use
              this if udev is not running or has rules that ignore the devices
              LVM2 creates.

       -l, --extents [-]LogicalExtentsNumber[%{VG|LV|FREE|ORIGIN}]
              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 value 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, relative to the existing size of the Logical  Volume
              with the suffix %LV, as a percentage of the remaining free space
              in the Volume Group with the suffix %FREE, or (for  a  snapshot)
              as  a percentage of the total space in the Origin Logical Volume
              with the suffix %ORIGIN.

       -L, --size [-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]
              Reduce or set the logical volume size in units of megabytes.   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 abso-
              lute size.

       -n, --nofsck
              Do  not  perform fsck before resizing filesystem when filesystem
              requires it. You may need to use --force to  proceed  with  this
              option.

       -r, --resizefs
              Resize  underlying  filesystem  together with the logical volume
              using fsadm(8).

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

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

Sistina Software UK LVM TOOLS 2.02.88(2)-RHEL5 (2013-06-25)        LVREDUCE(8)