уменьшить размер логического тома (Reduce the size of a logical volume)
Имя (Name)
lvreduce — Reduce the size of a logical volume
Синопсис (Synopsis)
lvreduce option_args position_args
[ option_args ]
Описание (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.
Использование (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 ]
[ 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 ]
[ --lockopt String ]
[ --longhelp ]
[ --nolocking ]
[ --profile String ]
[ --version ]
Параметры (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
Devices that the command can use. 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.
-h|--help
Display help text.
--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 before resizing filesystem when
filesystem requires it. You may need to use --force to
proceed with this option.
--nolocking
Disable locking.
--noudevsync
Disables udev synchronisation. 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
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. See lvmreport(7) for more information.
-r|--resizefs
Resize underlying filesystem together with the LV using
fsadm(8).
-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.)
Переменные (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.)
Переменные окружения (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.
Примеры (Examples)
Reduce the size of an LV by 3 logical extents:
lvreduce -l -3 vg00/lvol1
Смотри также (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), lvm2-activation-generator(8),
blkdeactivate(8), lvmdump(8),
dmeventd(8), lvmpolld(8), lvmlockd(8), lvmlockctl(8),
cmirrord(8), lvmdbusd(8), fsadm(8),
lvmsystemid(7), lvmreport(7), lvmraid(7), lvmthin(7), lvmcache(7)
