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)

Sistina Software UK                     LVM TOOLS 2.02.98(2) (2012-10-15)                            LVREDUCE(8)