LVREDUCE(8) manual page
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lvreduce -- reduce the size of a logical volume
lvreduce [-A|--autobackup
{y|n}] [--commandprofile ProfileName] [-d|--debug] [-h|--help] [-t|--test] [-v|--verbose]
[--version] [-f|--force] [--noudevsync] {-l|--extents [-]LogicalExtentsNumber[%{VG|LV|FREE|ORIGIN}]
| [-L|--size [-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]} [-n|--nofsck] [-r|--resizefs] LogicalVolume{Name|Path}
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.
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 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. The resulting value
for the subtraction is rounded downward, for the absolute size it is rounded
upward. N.B. In a future release, when expressed as a percentage with VG or
FREE, the number will be treated as an approximate total number of physical
extents to be freed (including extents used by any mirrors, for example).
The code may currently 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 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.
- --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)
.
Reduce
the size of logical volume lvol1 in volume group vg00 by 3 logical extents:
lvreduce -l -3 vg00/lvol1
fsadm(8)
, lvchange(8)
, lvconvert(8)
, lvcreate(8)
,
lvextend(8)
, lvm(8)
, lvresize(8)
, vgreduce(8)
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