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 [-]LogicalEx-
       tentsNumber[%{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)



Sistina Software UK                             LVM TOOLS 2.02.84(2) (2011-02-09)                                    LVREDUCE(8)