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LVREDUCE(8)							   LVREDUCE(8)

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]} [-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 any question.

       --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.

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

SEE ALSO
       lvchange(8),  lvconvert(8),  lvcreate(8),  lvextend(8),	lvm(8),	 lvre‐
       size(8), vgreduce(8)

Sistina Software UK    LVM TOOLS 2.02.61(1) (2010-02-15)	   LVREDUCE(8)

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