NAME

       lvreduce - reduce the size of a logical volume

SYNOPSIS

       lvreduce  [-A|--autobackup  {y|n}]  [-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 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 substraction is rounded downward, for the
              absolute size it is rounded upward.

       -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)