lvreduce man page on Archlinux

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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] [-h|--help] [-t|--test]
       [-v|--verbose] [--version]  [-f|--force]	 [--noudevsync]	 {-l|--extents
       [-]LogicalExtentsNumber[%{VG|LV|FREE|ORIGIN}]   |  [-L|--size  [-]Logi‐
       calVolumeSize[bBsSkKmMgGtTpPeE]}	 [-n|--nofsck]	[-r|--resizefs]	 Logi‐
       calVolume{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  suf‐
	      fix  %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 subtrac‐
	      tion is rounded downward, for the absolute size  it  is  rounded
	      upward.	N.B. In a future release, when expressed as a percent‐
	      age with VG or FREE, the number will be treated as  an  approxi‐
	      mate  total  number  of  physical extents to be freed (including
	      extents used by any mirrors, for example).  The  code  may  cur‐
	      rently 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 abso‐
	      lute 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 logi‐
       cal 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 2.02.106(2) (2014-04-10)	   LVREDUCE(8)
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