1LVREDUCE(8)                 System Manager's Manual                LVREDUCE(8)
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NAME

6       lvreduce - reduce the size of a logical volume
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SYNOPSIS

9       lvreduce [-A|--autobackup y|n] [-d|--debug] [-f|--force] [-h|-?|--help]
10       [--noudevsync] {-l|--extents  [-]LogicalExtentsNumber[%{VG|LV|FREE|ORI‐
11       GIN}] | -L|--size [-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]} [-n|--nofsck]
12       [-r|--resizefs] [-t|--test] [-v|--verbose] LogicalVolume[Path]
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DESCRIPTION

15       lvreduce allows you to reduce the size of a logical volume.  Be careful
16       when reducing a logical volume's size, because data in the reduced part
17       is lost!!!
18       You should therefore ensure  that  any  filesystem  on  the  volume  is
19       resized  before  running  lvreduce  so  that the extents that are to be
20       removed are not in use.
21       Shrinking snapshot logical volumes (see lvcreate(8) for information  to
22       create  snapshots)  is  supported as well.  But to change the number of
23       copies in a mirrored logical volume use lvconvert (8).
24       Sizes will be rounded if necessary - for example, the volume size  must
25       be an exact number of extents and the size of a striped segment must be
26       a multiple of the number of stripes.
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OPTIONS

29       See lvm for common options.
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31       -f, --force
32              Force size reduction without prompting even when  it  may  cause
33              data loss.
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35       --noudevsync
36              Disable  udev  synchronisation.  The  process  will not wait for
37              notification from udev.  It will continue  irrespective  of  any
38              possible udev processing in the background.  You should only use
39              this if udev is not running or has rules that ignore the devices
40              LVM2 creates.
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42       -l, --extents [-]LogicalExtentsNumber[%{VG|LV|FREE|ORIGIN}]
43              Reduce  or  set  the  logical  volume  size  in units of logical
44              extents.  With the - sign the value will be subtracted from  the
45              logical  volume's  actual  size and without it the value will be
46              taken as an absolute size.  The number can also be expressed  as
47              a  percentage  of  the  total space in the Volume Group with the
48              suffix %VG, relative to the existing size of the Logical  Volume
49              with the suffix %LV, as a percentage of the remaining free space
50              in the Volume Group with the suffix %FREE, or (for  a  snapshot)
51              as  a percentage of the total space in the Origin Logical Volume
52              with the suffix %ORIGIN.
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54       -L, --size [-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]
55              Reduce or set the logical volume size in units of megabytes.   A
56              size  suffix of k for kilobyte, m for megabyte, g for gigabytes,
57              t for terabytes, p for petabytes or e for exabytes is  optional.
58              With  the  -  sign the value will be subtracted from the logical
59              volume's actual size and without it it will be taken as an abso‐
60              lute size.
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62       -n, --nofsck
63              Do  not  perform fsck before resizing filesystem when filesystem
64              requires it. You may need to use --force to  proceed  with  this
65              option.
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67       -r, --resizefs
68              Resize  underlying  filesystem  together with the logical volume
69              using fsadm(8).
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Example

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

76       fsadm(8),  lvchange(8), lvconvert(8), lvcreate(8), lvextend(8), lvm(8),
77       lvresize(8), vgreduce(8)
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81Sistina Software UK    LVM TOOLS 2.02.84(2) (2011-02-09)           LVREDUCE(8)
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