lvextend(8)



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 mir-
       rored 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 allo-
              cate 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.  in-
              herit 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 information about profiles.

       --config String
              Config settings for the command. These override lvm.conf set-
              tings.  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 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 de-
              notes 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 lvm-
              lockd(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.

       --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 use-
              ful for skipping a potentially long and resource intensive ini-
              tial 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 no-
              tification from udev. It will continue irrespective of any pos-
              sible 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 --ver-
              bose.  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.  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 op-
              tions are alternate methods of specifying size.  The total num-
              ber 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 de-
              vices 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 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 un-
              usual 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|mir-
              ror|raid|thin|cache|vdo|thin-pool|cache-pool|vdo-pool
              The LV type, also known as "segment type" or "segtype".  See us-
              age descriptions for the specific ways to use these types.  For
              more information about redundancy and performance (raid<N>, mir-
              ror, 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 snap-
              shots (snapshot) see usage definitions.  For VDO (vdo) see
              lvmvdo(7).  Several commands omit an explicit type option be-
              cause 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 de-
              tail 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  posi-
              tional  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 extents, a PV positional arg generally accepts
              a suffix indicating a range (or multiple ranges) of physical ex-
              tents (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 con-
              tent.

       Size[UNIT]
              Size is an input number that accepts an  optional  unit.   Input
              units are always treated as base two values, regardless of capi-
              talization, e.g. 'k' and 'K' both refer to  1024.   The  default
              input unit is specified by letter, followed by |UNIT.  UNIT rep-
              resents other possible input units:  bBsSkKmMgGtTpPeE.   b|B  is
              bytes,  s|S  is  sectors  of 512 bytes, k|K is kilobytes, m|M is
              megabytes, g|G is gigabytes, t|T is terabytes, p|P is petabytes,
              e|E  is  exabytes.  (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) pvscan(8)

       vgcfgbackup(8) vgcfgrestore(8) vgchange(8) vgck(8)  vgcreate(8)  vgcon-
       vert(8)  vgdisplay(8)  vgexport(8)  vgextend(8)  vgimport(8)  vgimport-
       clone(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) lvre-
       duce(8) lvremove(8) lvrename(8) lvresize(8) lvs(8) lvscan(8)

       lvm-fullreport(8) lvm-lvpoll(8) lvm2-activation-generator(8) blkdeacti-
       vate(8) lvmdump(8)

       dmeventd(8)  lvmpolld(8)  lvmlockd(8)  lvmlockctl(8)  cmirrord(8) lvmd-
       busd(8)

       lvmsystemid(7) lvmreport(7) lvmraid(7) lvmthin(7) lvmcache(7)

Red Hat, Inc.          LVM TOOLS 2.03.07(2) (2019-11-30)           LVEXTEND(8)

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