lvextend(8) — Linux manual page


LVEXTEND(8)              System Manager's Manual             LVEXTEND(8)

NAME         top

       lvextend — Add space to a logical volume

SYNOPSIS         top

       lvextend option_args position_args
           [ option_args ]
           [ position_args ]

           --alloc contiguous|cling|cling_by_tags|normal|anywhere|
        -A|--autobackup y|n
           --commandprofile String
           --config String
           --devices PV
           --devicesfile String
           --driverloaded y|n
        -l|--extents [+]Number[PERCENT]
           --journal String
           --lockopt String
        -m|--mirrors Number
           --poolmetadatasize [+]Size[m|UNIT]
           --profile String
           --reportformat basic|json
        -L|--size [+]Size[m|UNIT]
        -i|--stripes Number
        -I|--stripesize Size[k|UNIT]
           --type linear|striped|snapshot|raid|mirror|thin|thin-pool|

DESCRIPTION         top

       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         top

       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] LV1
           [ -i|--stripes Number ]
           [ -I|--stripesize Size[k|UNIT] ]
           [ COMMON_OPTIONS ]
           [ PV ... ]

           LV1 types: thinpool


       Extend an LV according to a predefined policy.

       lvextend --usepolicies LV1
           [ -r|--resizefs ]
           [ COMMON_OPTIONS ]
           [ PV ... ]

           LV1 types: snapshot thinpool


       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|raid|mirror|thin|
           thin-pool|vdo|vdo-pool|cache|cache-pool|writecache ]

       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         top

       --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

       -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

       --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.

              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.

              Display long help text.

       -m|--mirrors Number
              Not used.

              Do not perform fsck before resizing filesystem when
              filesystem requires it. You may need to use --force to
              proceed with this option.

              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.

              Disable locking.

              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.

              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.

              Resize underlying filesystem together with the LV using

       -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)

       -I|--stripesize Size[k|UNIT]
              The amount of data that is written to one device before
              moving to the next in a striped LV.

              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|
              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.

              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.

              Display version information.

              Do not prompt for confirmation interactively but always
              assume the answer yes. Use with extreme caution.  (For
              automatic no, see -qq.)

VARIABLES         top

       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 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


       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         top

       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         top

       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)

COLOPHON         top

       This page is part of the lvm2 (Logical Volume Manager 2) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report for
       this manual page, see ⟨⟩.
       This page was obtained from the project's upstream Git repository
       ⟨git://⟩ on 2023-12-22.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2023-12-06.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Red Hat, Inc.     LVM TOOLS 2.03.24(2)-git (2023-11-21)      LVEXTEND(8)

Pages that refer to this page: lvmcache(7)lvmraid(7)lvmthin(7)lvmvdo(7)dmeventd(8)lvchange(8)lvconvert(8)lvcreate(8)lvdisplay(8)lvextend(8)lvm(8)lvmconfig(8)lvmdevices(8)lvmdiskscan(8)lvm-fullreport(8)lvm-lvpoll(8)lvreduce(8)lvremove(8)lvrename(8)lvresize(8)lvs(8)lvscan(8)pvchange(8)pvck(8)pvcreate(8)pvdisplay(8)pvmove(8)pvremove(8)pvresize(8)pvs(8)pvscan(8)resize2fs(8)vgcfgbackup(8)vgcfgrestore(8)vgchange(8)vgck(8)vgconvert(8)vgcreate(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)