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LVEXTEND(8) System Manager's Manual LVEXTEND(8)
NAME
lvextend - Add space to a logical volume
SYNOPSIS
lvextend option_args position_args
[ option_args ]
[ position_args ]
--alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit
-A|--autobackup y|n
--commandprofile String
--config String
-d|--debug
--driverloaded y|n
-l|--extents [+]Number[PERCENT]
-f|--force
-h|--help
--lockopt String
--longhelp
-m|--mirrors Number
-n|--nofsck
--nolocking
--nosync
--noudevsync
--poolmetadatasize [+]Size[m|UNIT]
--profile String
-q|--quiet
--reportformat basic|json
-r|--resizefs
-L|--size [+]Size[m|UNIT]
-i|--stripes Number
-I|--stripesize Size[k|UNIT]
-t|--test
--type linear|striped|snapshot|mir-
ror|raid|thin|cache|vdo|thin-pool|cache-pool|vdo-pool
--usepolicies
-v|--verbose
--version
-y|--yes
DESCRIPTION
lvextend extends the size of an LV. This requires allocating logical extents from the VG's
free physical extents. If the extension adds a new LV segment, the new segment will use
the existing segment type of the LV.
Extending a copy-on-write snapshot LV adds space for COW blocks.
Use lvconvert(8) to change the number of data images in a RAID or mirrored LV.
In the usage section below, --size Size can be replaced with --extents Number. See both
descriptions the options section.
USAGE
Extend an LV by a specified size.
lvextend -L|--size [+]Size[m|UNIT] LV
[ -l|--extents [+]Number[PERCENT] ]
[ -r|--resizefs ]
[ -i|--stripes Number ]
[ -I|--stripesize Size[k|UNIT] ]
[ --poolmetadatasize [+]Size[m|UNIT] ]
[ COMMON_OPTIONS ]
[ PV ... ]
-
Extend an LV by specified PV extents.
lvextend LV PV ...
[ -r|--resizefs ]
[ -i|--stripes Number ]
[ -I|--stripesize Size[k|UNIT] ]
[ COMMON_OPTIONS ]
-
Extend a pool metadata SubLV by a specified size.
lvextend --poolmetadatasize [+]Size[m|UNIT] LV_thinpool
[ -i|--stripes Number ]
[ -I|--stripesize Size[k|UNIT] ]
[ COMMON_OPTIONS ]
[ PV ... ]
-
Extend an LV according to a predefined policy.
lvextend --usepolicies LV_snapshot_thinpool
[ -r|--resizefs ]
[ COMMON_OPTIONS ]
[ PV ... ]
-
Common options for command:
[ -A|--autobackup y|n ]
[ -f|--force ]
[ -m|--mirrors Number ]
[ -n|--nofsck ]
[ --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit ]
[ --nosync ]
[ --noudevsync ]
[ --reportformat basic|json ]
[ --type linear|striped|snapshot|mir-
ror|raid|thin|cache|vdo|thin-pool|cache-pool|vdo-pool ]
Common options for lvm:
[ -d|--debug ]
[ -h|--help ]
[ -q|--quiet ]
[ -t|--test ]
[ -v|--verbose ]
[ -y|--yes ]
[ --commandprofile String ]
[ --config String ]
[ --driverloaded y|n ]
[ --lockopt String ]
[ --longhelp ]
[ --nolocking ]
[ --profile String ]
[ --version ]
OPTIONS
--alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit
Determines the allocation policy when a command needs to allocate Physical Extents
(PEs) from the VG. Each VG and LV has an allocation policy which can be changed
with vgchange/lvchange, or overriden on the command line. normal applies common
sense rules such as not placing parallel stripes on the same PV. inherit applies
the VG policy to an LV. contiguous requires new PEs be placed adjacent to existing
PEs. cling places new PEs on the same PV as existing PEs in the same stripe of the
LV. If there are sufficient PEs for an allocation, but normal does not use them,
anywhere will use them even if it reduces performance, e.g. by placing two stripes
on the same PV. Optional positional PV args on the command line can also be used
to limit which PVs the command will use for allocation. See lvm(8) for more infor-
mation about allocation.
-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 in-
formation about profiles.
--config String
Config settings for the command. These override lvm.conf settings. The String arg
uses the same format as lvm.conf, 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).
--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 op-
tions are alternate methods of specifying size. The total number of physical ex-
tents used will be greater when redundant data is needed for RAID levels. An al-
ternate 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 de-
fines 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 in-
formation.
--longhelp
Display long help text.
-m|--mirrors Number
Not used.
-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.
--nosync
Causes the creation of mirror, raid1, raid4, raid5 and raid10 to skip the initial
synchronization. In case of mirror, raid1 and raid10, any data written afterwards
will be mirrored, but the original contents will not be copied. In case of raid4
and raid5, no parity blocks will be written, though any data written afterwards
will cause parity blocks to be stored. This is useful for skipping a potentially
long and resource intensive initial sync of an empty mirror/raid1/raid4/raid5 and
raid10 LV. This option is not valid for raid6, because raid6 relies on proper par-
ity (P and Q Syndromes) being created during initial synchronization in order to
reconstruct proper user date in case of device failures. raid0 and raid0_meta do
not provide any data copies or parity support and thus do not support initial syn-
chronization.
--noudevsync
Disables udev synchronisation. The process will not wait for notification from
udev. It will continue irrespective of any possible udev processing in the back-
ground. Only use this if udev is not running or has rules that ignore the devices
LVM creates.
--poolmetadatasize [+]Size[m|UNIT]
Specifies the new size of the pool metadata LV. The plus prefix + can be used, in
which case the value is added to the current size.
--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 re-
port/output_format setting in lvm.conf. 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 for-
mat. 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.
-i|--stripes Number
Specifies the number of stripes in a striped LV. This is the number of PVs (de-
vices) that a striped LV is spread across. Data that appears sequential in the LV
is spread across multiple devices in units of the stripe size (see --stripesize).
This does not change existing allocated space, but only applies to space being al-
located by the command. When creating a RAID 4/5/6 LV, this number does not in-
clude the extra devices that are required for parity. The largest number depends on
the RAID type (raid0: 64, raid10: 32, raid4/5: 63, raid6: 62), and when unspeci-
fied, the default depends on the RAID type (raid0: 2, raid10: 2, raid4/5: 3, raid6:
5.) To stripe a new raid LV across all PVs by default, see lvm.conf alloca-
tion/raid_stripe_all_devices.
-I|--stripesize Size[k|UNIT]
The amount of data that is written to one device before moving to the next in a
striped LV.
-t|--test
Run in test mode. Commands will not update metadata. This is implemented by dis-
abling all metadata writing but nevertheless returning success to the calling func-
tion. 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.
--type linear|striped|snapshot|mirror|raid|thin|cache|vdo|thin-pool|cache-pool|vdo-pool
The LV type, also known as "segment type" or "segtype". See usage descriptions for
the specific ways to use these types. For more information about redundancy and
performance (raid<N>, mirror, striped, linear) see lvmraid(7). For thin provision-
ing (thin, thin-pool) see lvmthin(7). For performance caching (cache, cache-pool)
see lvmcache(7). For copy-on-write snapshots (snapshot) see usage definitions.
For VDO (vdo) see lvmvdo(7). Several commands omit an explicit type option because
the type is inferred from other options or shortcuts (e.g. --stripes, --mirrors,
--snapshot, --virtualsize, --thin, --cache, --vdo). Use inferred types with care
because it can lead to unexpected results.
--usepolicies
Perform an operation according to the policy configured in lvm.conf or a profile.
-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. LV followed by _<type> indicates
that an LV of the given type is required. (raid represents raid<N> type)
PV
Physical Volume name, a device path under /dev. For commands managing physical ex-
tents, a PV positional arg generally accepts a suffix indicating a range (or multi-
ple ranges) of physical extents (PEs). When the first PE is omitted, it defaults to
the start of the device, and when the last PE is omitted it defaults to end. Start
and end range (inclusive): PV[:PE-PE]... Start and length range (counting from 0):
PV[:PE+PE]...
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 re-
fer to 1024. The default input unit is specified by letter, followed by |UNIT.
UNIT represents other possible input units: bBsSkKmMgGtTpPeE. 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
Extend the size of an LV by 54MiB, using a specific PV.
lvextend -L +54 vg01/lvol10 /dev/sdk3
Extend the size of an LV by the amount of free space on PV /dev/sdk3. This is equivalent
to specifying "-l +100%PVS" on the command line.
lvextend vg01/lvol01 /dev/sdk3
Extend an LV by 16MiB using specific physical extents.
lvextend -L+16m vg01/lvol01 /dev/sda:8-9 /dev/sdb:8-9
SEE ALSO
lvm(8) lvm.conf(5) lvmconfig(8)
pvchange(8) pvck(8) pvcreate(8) pvdisplay(8) pvmove(8) pvremove(8) pvresize(8) pvs(8) pvs-
can(8)
vgcfgbackup(8) vgcfgrestore(8) vgchange(8) vgck(8) vgcreate(8) vgconvert(8) vgdisplay(8)
vgexport(8) vgextend(8) vgimport(8) vgimportclone(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)
lvmsystemid(7) lvmreport(7) lvmraid(7) lvmthin(7) lvmcache(7)
Red Hat, Inc. LVM TOOLS 2.03.11(2) (2021-01-08) LVEXTEND(8)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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Under GNU General Public License
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