Provided by: lvm2_2.03.22-1ubuntu2_amd64 
NAME
lvreduce — Reduce the size of a logical volume
SYNOPSIS
lvreduce option_args position_args
[ option_args ]
DESCRIPTION
lvreduce reduces the size of an LV. The freed logical extents are returned to the VG to be
used by other LVs. A copy-on-write snapshot LV can also be reduced if less space is needed
to hold COW blocks. Use lvconvert(8) to change the number of data images in a RAID or
mirrored LV.
Be careful when reducing an LV's size, because data in the reduced area is lost. Ensure
that any file system on the LV is resized before running lvreduce so that the removed
extents are not in use by the file system.
Sizes will be rounded if necessary. For example, the LV size must be an exact number of
extents, and the size of a striped segment must be a multiple of the number of stripes.
In the usage section below, --size Size can be replaced with --extents Number. See both
descriptions the options section.
USAGE
lvreduce -L|--size [-]Size[m|UNIT] LV
[ -l|--extents [-]Number[PERCENT] ]
[ -A|--autobackup y|n ]
[ -f|--force ]
[ -n|--nofsck ]
[ -r|--resizefs ]
[ --noudevsync ]
[ --reportformat basic|json|json_std ]
[ --fs String ]
[ --fsmode String ]
[ COMMON_OPTIONS ]
Common options for lvm:
[ -d|--debug ]
[ -h|--help ]
[ -q|--quiet ]
[ -t|--test ]
[ -v|--verbose ]
[ -y|--yes ]
[ --commandprofile String ]
[ --config String ]
[ --devices PV ]
[ --devicesfile String ]
[ --driverloaded y|n ]
[ --journal String ]
[ --lockopt String ]
[ --longhelp ]
[ --nohints ]
[ --nolocking ]
[ --profile String ]
[ --version ]
OPTIONS
-A|--autobackup y|n
Specifies if metadata should be backed up automatically after a change. Enabling
this is strongly advised! See vgcfgbackup(8) for more information.
--commandprofile String
The command profile to use for command configuration. See lvm.conf(5) for more
information about profiles.
--config String
Config settings for the command. These override lvm.conf(5) settings. The String
arg uses the same format as lvm.conf(5), or may use section/field syntax. See
lvm.conf(5) for more information about config.
-d|--debug ...
Set debug level. Repeat from 1 to 6 times to increase the detail of messages sent
to the log file and/or syslog (if configured).
--devices PV
Restricts the devices that are visible and accessible to the command. Devices not
listed will appear to be missing. This option can be repeated, or accepts a comma
separated list of devices. This overrides the devices file.
--devicesfile String
A file listing devices that LVM should use. The file must exist in
/etc/lvm/devices/ and is managed with the lvmdevices(8) command. This overrides
the lvm.conf(5) devices/devicesfile and devices/use_devicesfile settings.
--driverloaded y|n
If set to no, the command will not attempt to use device-mapper. For testing and
debugging.
-l|--extents [-]Number[PERCENT]
Specifies the new size of the LV in logical extents. The --size and --extents
options are alternate methods of specifying size. The total number of physical
extents used will be greater when redundant data is needed for RAID levels. An
alternate syntax allows the size to be determined indirectly as a percentage of the
size of a related VG, LV, or set of PVs. The suffix %VG denotes the total size of
the VG, the suffix %FREE the remaining free space in the VG, and the suffix %PVS
the free space in the specified PVs. For a snapshot, the size can be expressed as
a percentage of the total size of the origin LV with the suffix %ORIGIN (100%ORIGIN
provides space for the whole origin). When expressed as a percentage, the size
defines an upper limit for the number of logical extents in the new LV. The precise
number of logical extents in the new LV is not determined until the command has
completed. When the plus + or minus - prefix is used, the value is not an absolute
size, but is relative and added or subtracted from the current size.
-f|--force ...
Override various checks, confirmations and protections. Use with extreme caution.
--fs String
Control file system resizing when resizing an LV. checksize: Check the fs size and
reduce the LV if the fs is not using the reduced space (fs reduce is not needed.)
If the reduced space is used by the fs, then do not resize the fs or LV, and return
an error. (checksize only applies when reducing, and does nothing for extend.)
resize: Resize the fs by calling the fs-specific resize command. This may also
include mounting, unmounting, or running fsck. See --fsmode to control mounting
behavior, and --nofsck to disable fsck. resize_fsadm: Use the old method of
calling fsadm to handle the fs (deprecated.) Warning: this option does not prevent
lvreduce from destroying file systems that are unmounted (or mounted if prompts are
skipped.) ignore: Resize the LV without checking for or handling a file system.
Warning: using ignore when reducing the LV size may destroy the file system.
--fsmode String
Control file system mounting behavior for fs resize. manage: Mount or unmount the
fs as needed to resize the fs, and attempt to restore the original mount state at
the end. nochange: Do not mount or unmount the fs. If mounting or unmounting is
required to resize the fs, then do not resize the fs or the LV and fail the
command. offline: Unmount the fs if it is mounted, and resize the fs while it is
unmounted. If mounting is required to resize the fs, then do not resize the fs or
the LV and fail the command.
-h|--help
Display help text.
--journal String
Record information in the systemd journal. This information is in addition to
information enabled by the lvm.conf log/journal setting. command: record
information about the command. output: record the default command output. debug:
record full command debugging.
--lockopt String
Used to pass options for special cases to lvmlockd. See lvmlockd(8) for more
information.
--longhelp
Display long help text.
-n|--nofsck
Do not perform fsck when resizing the file system with --resizefs.
--nohints
Do not use the hints file to locate devices for PVs. A command may read more
devices to find PVs when hints are not used. The command will still perform
standard hint file invalidation where appropriate.
--nolocking
Disable locking. Use with caution, concurrent commands may produce incorrect
results.
--noudevsync
Disables udev synchronization. The process will not wait for notification from
udev. It will continue irrespective of any possible udev processing in the
background. Only use this if udev is not running or has rules that ignore the
devices LVM creates.
--profile String
An alias for --commandprofile or --metadataprofile, depending on the command.
-q|--quiet ...
Suppress output and log messages. Overrides --debug and --verbose. Repeat once to
also suppress any prompts with answer 'no'.
--reportformat basic|json|json_std
Overrides current output format for reports which is defined globally by the
report/output_format setting in lvm.conf(5). basic is the original format with
columns and rows. If there is more than one report per command, each report is
prefixed with the report name for identification. json produces report output in
JSON format. json_std produces report output in JSON format which is more compliant
with JSON standard. See lvmreport(7) for more information.
-r|--resizefs
Resize the fs using the fs-specific resize command. May include mounting,
unmounting, or running fsck. See --fsmode to control mounting behavior, and
--nofsck to disable fsck. See --fs for more options (--resizefs is equivalent to
--fs resize.)
-L|--size [-]Size[m|UNIT]
Specifies the new size of the LV. The --size and --extents options are alternate
methods of specifying size. The total number of physical extents used will be
greater when redundant data is needed for RAID levels. When the plus + or minus -
prefix is used, the value is not an absolute size, but is relative and added or
subtracted from the current size.
-t|--test
Run in test mode. Commands will not update metadata. This is implemented by
disabling all metadata writing but nevertheless returning success to the calling
function. This may lead to unusual error messages in multi-stage operations if a
tool relies on reading back metadata it believes has changed but hasn't.
-v|--verbose ...
Set verbose level. Repeat from 1 to 4 times to increase the detail of messages sent
to stdout and stderr.
--version
Display version information.
-y|--yes
Do not prompt for confirmation interactively but always assume the answer yes. Use
with extreme caution. (For automatic no, see -qq.)
VARIABLES
LV Logical Volume name. See lvm(8) for valid names. An LV positional arg generally
includes the VG name and LV name, e.g. VG/LV.
String See the option description for information about the string content.
Size[UNIT]
Size is an input number that accepts an optional unit. Input units are always
treated as base two values, regardless of capitalization, e.g. 'k' and 'K' both
refer to 1024. The default input unit is specified by letter, followed by |UNIT.
UNIT represents other possible input units: b|B is bytes, s|S is sectors of 512
bytes, k|K is KiB, m|M is MiB, g|G is GiB, t|T is TiB, p|P is PiB, e|E is EiB.
(This should not be confused with the output control --units, where capital letters
mean multiple of 1000.)
ENVIRONMENT VARIABLES
See lvm(8) for information about environment variables used by lvm. For example,
LVM_VG_NAME can generally be substituted for a required VG parameter.
EXAMPLES
Reduce the size of an LV by 3 logical extents:
lvreduce -l -3 vg00/lvol1
SEE ALSO
lvm(8), lvm.conf(5), lvmconfig(8), lvmdevices(8),
pvchange(8), pvck(8), pvcreate(8), pvdisplay(8), pvmove(8), pvremove(8), pvresize(8),
pvs(8), pvscan(8),
vgcfgbackup(8), vgcfgrestore(8), vgchange(8), vgck(8), vgcreate(8), vgconvert(8),
vgdisplay(8), vgexport(8), vgextend(8), vgimport(8), vgimportclone(8), vgimportdevices(8),
vgmerge(8), vgmknodes(8), vgreduce(8), vgremove(8), vgrename(8), vgs(8), vgscan(8),
vgsplit(8),
lvcreate(8), lvchange(8), lvconvert(8), lvdisplay(8), lvextend(8), lvreduce(8),
lvremove(8), lvrename(8), lvresize(8), lvs(8), lvscan(8),
lvm-fullreport(8), lvm-lvpoll(8), blkdeactivate(8), lvmdump(8),
dmeventd(8), lvmpolld(8), lvmlockd(8), lvmlockctl(8), cmirrord(8), lvmdbusd(8), fsadm(8),
lvmsystemid(7), lvmreport(7), lvmcache(7), lvmraid(7), lvmthin(7), lvmvdo(7),
lvmautoactivation(7)