manuals

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|ORIGIN}]        |        -L|--size
       [-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]}  [-n|--nofsck]  [-r|--resizefs]
       [-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 prompting even when it may cause
              data loss.

       --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
              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.

       -r, --resizefs
              Resize underlying filesystem together with  the  logical  volume
              using fsadm(8).

Example

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

SEE ALSO

       fsadm(8), lvchange(8), lvconvert(8), lvcreate(8), lvextend(8),  lvm(8),
       lvresize(8), vgreduce(8)