Provided by: lvm2_2.02.133-1ubuntu10_amd64 bug

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)