table of contents
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
--devices PV
--devicesfile String
--driverloaded y|n
-l|--extents [+]Number[PERCENT]
-f|--force
-h|--help
--journal String
--lockopt String
--longhelp
-m|--mirrors Number
-n|--nofsck
--nohints
--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|raid|mirror|thin|thin-pool|vdo|vdo-pool|cache|cache-pool|writecache
--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
[ -r|--resizefs ]
[ -i|--stripes Number ]
[ -I|--stripesize Size[k|UNIT] ]
[ --poolmetadatasize [+]Size[m|UNIT] ]
[ COMMON_OPTIONS ]
—
Extend an LV by specified PV extents.
lvextend LV PV ...
[ -i|--stripes Number ]
[ -I|--stripesize Size[k|UNIT] ]
[ COMMON_OPTIONS ]
—
Extend a pool metadata SubLV by a specified size.
lvextend --poolmetadatasize
[+]Size[m|UNIT] LV1
[ -I|--stripesize Size[k|UNIT] ]
[ COMMON_OPTIONS ]
—
Extend an LV according to a predefined policy.
lvextend --usepolicies LV1
[ COMMON_OPTIONS ]
—
Common options for command:
[ -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|raid|mirror|thin|thin-pool|vdo|vdo-pool|cache|cache-pool|writecache ]
Common options for lvm:
[ -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¶
--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 overridden 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 information 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 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.
-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.
-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.
--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.
--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 parity (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
synchronization.
--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.
--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
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.
-i|--stripes Number
Specifies the number of stripes in a striped LV. This is the number of PVs
(devices) 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 allocated by the command. When creating a RAID 4/5/6
LV, this number does not include 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 unspecified, 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(5)
allocation/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
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.
--type
linear|striped|snapshot|raid|mirror|thin|thin-pool|vdo|vdo-pool|cache|cache-pool|writecache
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 provisioning (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(5)
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. LV1 indicates the LV must have a specific type, where the accepted LV types are listed. (raid represents raid<N> type).
- PV
- Physical Volume name, a device path under /dev. For commands managing physical extents, a PV positional arg generally accepts a suffix indicating a range (or multiple 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 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¶
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
Extend an LV to use all remaining free space in volume group and
all resize its filesystem with fsadm(8).
lvextend -l+100%FREE -r vg01/lvol01
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)
LVM TOOLS 2.03.14(2)-RHEL8 (2021-10-20) | Red Hat, Inc. |