NAME

       lvreduce — reduce the size of a logical volume

SYNOPSIS

       lvreduce  [-A|--autobackup  {y|n}] [--commandprofile ProfileName] [-d|--debug] [-h|--help]
       [-t|--test]   [-v|--verbose]   [--version]   [-f|--force]   [--noudevsync]   {-l|--extents
       [-]LogicalExtentsNumber[%{VG|LV|FREE|ORIGIN}]                 |                 [-L|--size
       [-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]}           [-n|--nofsck]            [-r|--resizefs]
       LogicalVolume{Name|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(8) for common options.

       -f, --force
              Force size reduction without prompting even when it may cause data loss.

       -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 total number of physical  extents
              freed  will  be  greater  than  this  logical  value if, for example, the volume is
              mirrored.  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.   The  resulting
              value  for the subtraction is rounded downward, for the absolute size it is rounded
              upward.  N.B. In a future release, when expressed as a percentage with VG or  FREE,
              the number will be treated as an approximate total number of physical extents to be
              freed (including extents used by any mirrors, for example).  The code may currently
              release more space than you might otherwise expect.

       -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 absolute 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.

       --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.

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

Examples

       Reduce the size of logical volume lvol1 in volume group vg00 by 3 logical extents:

       lvreduce -l -3 vg00/lvol1

SEE ALSO

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