NAME | SYNOPSIS | DESCRIPTION | COMMANDS | OPTIONS | Examples | SEE ALSO | COLOPHON

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

NAME         top

       lvconvert — change LV type and other utilities

SYNOPSIS         top

       lvconvert [OPTION]...  VolumeGroup/LogicalVolume

       OPTIONS:
       -b, --background
       --cachepolicy Policy
       --cachepool CachePoolLogicalVolume{Name|Path}
       --cachesettings Key=Value
       -c, --chunksize ChunkSize[b|B|s|S|k|K|m|M|g|G]
       --corelog
       --discards {ignore|nopassdown|passdown}
       -i, --interval Seconds
       --merge
       --mirrorlog {disk|core|mirrored}
       -m, --mirrors Number
       -n, --name Name
       --noudevsync
       --originname NewExternalOriginVolumeName
       --poolmetadata PoolMetadataLogicalVolume{Name|Path}
       --poolmetadatasize PoolMetadataSize[b|B|s|S|k|K|m|M|g|G]
       --poolmetadataspare {y|n}
       -r, --readahead {ReadAheadSectors|auto|none}
       -R, --regionsize MirrorLogRegionSize
       --repair
       --replace PhysicalVolume
       --splitcache
       --splitmirrors Number
       --splitsnapshot
       --stripes Number
       -I, --stripesize StripeSize
       --type striped
       --type snapshot | --snapshot | -s
       --type mirror
       --type raid*
       --type thin | --thin | -T
       --type cache | --cache | -H
       --type thin-pool
       --type cache-pool
       --thinpool ThinPoolLogicalVolume{Name|Path}
       --trackchanges
       --uncache
       -Z, --zero {y|n}

       Common options:
       -A, --alloc AllocationPolicy
       -f, --force
       --commandprofile ProfileName
       -h, -?, --help
       -v, --verbose
       -y, --yes
       --version

DESCRIPTION         top

       lvconvert changes the LV type and includes various LV utilities.

       To display the current LV type, run the command:

       lvs -o name,segtype VG/LV

       To change the LV type, run the command:

       lvconvert --type NewType VG/LV

   LV types
       The LV type is also called the "segment type" or "segtype".

       LVs with the following types can be modified by lvconvert: striped,
       snapshot, mirror, raid*, thin, cache, thin-pool, cache-pool.

       The specific operations available on each LV type are listed below.

       The linear type is equivalent to the striped type when one stripe
       exists.  In that case, the types can sometimes be used
       interchangably.

       In most cases, the mirror type is deprecated and the raid1 type
       should be used.  They are both implementations of mirroring.

       The raid* type refers to one of many raid levels, e.g.  raid1, raid5.

   LV layers
       In some cases, an LV is a single device mapper (dm) layer above
       physical devices.  In other cases, hidden LVs (dm devices) are
       layered between the visible LV and physical devices.  LVs in the
       middle layers are sometimes called sub LVs.

       Changing the LV type will often change the composition of sub LVs.

       Sub LVs can be displayed with the command lvs -a.

       A command run on a visible LV sometimes operates on a sub LV rather
       than the specified LV.  These cases are noted below.

       Sometimes a sub LV must be specified directly on the command line,
       but this is a non-standard form.  These cases may change in the
       future to avoid the direct use of hidden LVs.

COMMANDS         top

   Operations on a StripedLV with type striped or linear:

       lvconvert --merge VG/StripedLV
       · Merge StripedLV into an LV when it is a previously split mirror.
       · Options --background, --interval.
       · See corresponding operation --splitmirrors.

       lvconvert --type snapshot VG/StripedLV VG/SnapshotLV
       · Recombine StripedLV with SnapshotLV which was previously split.
       · Options --chunksize, --zero.
       · See corresponding operation --splitsnapshot.

       lvconvert --type thin VG/StripedLV
       · Convert StripedLV to type thin with an external origin.
       · StripedLV becomes a read-only external origin LV with a new name.
       · Requires --thinpool to specify the thin pool to use.
       · Options --originname.

       lvconvert --type cache VG/StripedLV
       · Convert StripedLV to type cache.
       · Requires --cachepool to specify the cache pool to use.
       · Options --cachepolicy, --cachesettings.

       lvconvert --type thin-pool VG/StripedLV
       · Convert StripedLV to type thin-pool.
       · The StripedLV is used for thin pool data.
       · Options --chunksize, --discards, --poolmetadata{size,spare},
         --readahead, --zero.

       lvconvert --type cache-pool VG/StripedLV
       · Convert StripedLV to type cache-pool.
       · Options --chunksize, --poolmetadata{size,spare}.

       lvconvert --type mirror VG/StripedLV
       · Convert StripedLV to type mirror.
       · Requires --mirrors to specify the number of mirrors to use.
       · Options --mirrorlog, --regionsize.

       lvconvert --type raid* VG/StripedLV
       · Convert StripedLV to type raid*.
       · Required options depend on the raid level.

   Operations on RaidLV with type raid*:

       lvconvert --mirrors Number VG/RaidLV
       · Change the number of images in raid1 RaidLV.

       lvconvert --splitmirrors Number VG/RaidLV
       · Split images from raid1 RaidLV and use them to create a new LV.
       · Requires --name for the new LV, or the use of --trackchanges.

       lvconvert --merge VG/RaidLV
       · Merge RaidLV into an LV when it is a previously split mirror.
       · Options --background, --interval.
       · See corresponding operation --splitmirrors.

       lvconvert --repair VG/RaidLV
       · Options --background, --interval.
       · Replace failed PVs in RaidLV.

       lvconvert --replace PV VG/RaidLV
       · Replace specific PV(s) in a raid* LV with another PV.
       · The new PV(s) to use can be optionally specified after the LV.
       · Repeat to replace multiple: --replace PV1 --replace PV2 ...

       lvconvert --type snapshot VG/RaidLV VG/SnapshotLV
       · Combine RaidLV with SnapshotLV that was previously split.
       · Options --chunksize, --zero.
       · See corresponding operation --splitsnapshot.

       lvconvert --type thin VG/RaidLV
       · Convert RaidLV to type thin with an external origin.
       · RaidLV becomes a read-only external origin LV with a new name.
       · Requires --thinpool to specify the thin pool to use.
       · Options --originname.

       lvconvert --type cache VG/RaidLV
       · Convert RaidLV to type cache.
       · Requires --cachepool to specify the cache pool to use.
       · Options --cachepolicy, --cachesettings.

       lvconvert --type thin-pool VG/RaidLV
       · Convert RaidLV to type thin-pool.
       · The RaidLV is used for thin pool data.
       · Options --chunksize, --discards, --poolmetadata{size,spare},
         --readahead, --zero.

       lvconvert --type cache-pool VG/RaidLV
       · Convert RaidLV to type cache-pool.
       · Options --chunksize, --poolmetadata{size,spare}.

       lvconvert --type raid* VG/RaidLV
       · Convert RaidLV to use a different raid level.
       · Required options depend on the raid level.

       lvconvert --type mirror VG/RaidLV
       · Convert RaidLV to type mirror.

       lvconvert --type striped VG/RaidLV
       · Convert RaidLV to type striped.

       lvconvert --type linear VG/RaidLV
       · Convert RaidLV to type linear.

   Operations on MirrorLV with type mirror:

       lvconvert --mirrors Number VG/MirrorLV
       · Change the number of images in MirrorLV.

       lvconvert --splitmirrors Number VG/MirrorLV
       · Split images from MirrorLV and use them to create a new LV.
       · Requires --name for the new LV.

       lvconvert --mirrorlog LogType VG/MirrorLV
       · Change the type of log used by MirrorLV.

       lvconvert --repair VG/MirrorLV
       · Options --background, --interval.
       · Replace failed PVs in MirrorLV.

       lvconvert --type linear VG/MirrorLV
       · Convert MirrorLV to type linear.

       lvconvert --type raid* VG/MirrorLV
       · Convert MirrorLV to type raid*.
       · Required options depend on the raid level.

   Operations on CachePoolLV with type cache-pool:

       lvconvert --splitcache VG/CachePoolLV
       · Split the cache LV from CachePoolLV.
       · Equivalent to --splitcache on CacheLV.

   Operations on CacheLV with type cache:

       lvconvert --splitcache VG/CacheLV
       · Split and keep the cache pool from CacheLV.

       lvconvert --uncache VG/CacheLV
       · Split and remove the cache pool from CacheLV.

       lvconvert --splitmirrors Number VG/CacheLV
       · Split images from the mirrored origin of CacheLV to create a new
       LV.
       · Operates on mirror or raid1 sub LV.
       · Requires --name for the new LV, or the use of --trackchanges.

       lvconvert --type thin-pool VG/CacheLV
       · Convert CacheLV to type thin-pool.
       · The CacheLV is used for thin pool data.
       · Options --chunksize, --discards, --poolmetadata{size,spare},
         --readahead, --zero.

   Operations on ThinPoolLV with type thin-pool:

       lvconvert --splitcache VG/ThinPoolLV
       · Split and keep the cache pool from the data portion of ThinPoolLV.
       · Operates on the data sub LV of the thin pool LV.
       · The data sub LV of the thin pool must be a cache LV.

       lvconvert --uncache VG/ThinPoolLV
       · Split and remove the cache pool from the data portion of
       ThinPoolLV.
       · Operates on the data sub LV of the thin pool LV.
       · The data sub LV of the thin pool must be a cache LV.

       lvconvert --type cache VG/ThinPoolLV
       · Convert the data portion of ThinPoolLV to type cache.
       · Requires --cachepool to specify the cache pool to use.
       · Operates on the data sub LV of the thin pool LV.
       · Options --cachepolicy, --cachesettings.

       lvconvert --repair VG/ThinPoolLV
       · Repair ThinPoolLV.

   Operations on ThinLV with type thin:

       lvconvert --merge VG/ThinLV
       · Merge ThinLV into its origin LV.
       · ThinLV must have been created as a snapshot of another thin LV.
       · Options --background, --interval.

   Operations on SnapshotLV with type snapshot:

       lvconvert --splitsnapshot VG/SnapshotLV
       · Separate COW snapshot SnapshotLV from its origin LV.

       lvconvert --merge VG/SnapshotLV
       · Merge COW snapshot SnapshotLV into its origin.
       · Options --background, --interval.

OPTIONS         top

       See lvm(8) for common options.

       -b, --background
              If the operation requires polling, this option causes the
              command to return before the operation is complete, and
              polling is done in the background.

       --cachepolicy Policy
              Specifies the cache policy for a cache LV.  Also see
              lvmcache(7).

       --cachepool CachePoolLogicalVolume{Name|Path}
              Specifies the cache pool to use when converting an LV to a
              cache LV.  If CachePoolLogicalVolume is not yet a cache pool,
              the command will attempt to convert it into a cache pool prior
              to the cache LV conversion.  Also see lvmcache(7).

       --cachesettings Key=Value
              Specifies tunable values for a cache LV.  (The default values
              should usually be adequate.)  The special string value default
              switches settings back to their default kernel values and
              removes them from the list of settings stored in LVM metadata.
              Also see lvmcache(7).

       -c, --chunksize ChunkSize[b|B|s|S|k|K|m|M|g|G]
              Sets the chunk size for a snapshot, cache pool or thin pool.
              The default unit is in kilobytes.

              For snapshots, the value must be a power of 2 between 4KiB and
              512KiB and the default value is 4.

              For a cache pool the value must be between 32KiB and 1GiB and
              the default value is 64.

              For a thin pool the value must be between 64KiB and 1GiB and
              the default value starts with 64 and scales up to fit the pool
              metadata size within 128MiB, if the pool metadata size is not
              specified.  The value must be a multiple of 64KiB.  (Early
              kernel support until thin target version 1.4 required the
              value to be a power of 2.  Discards were not supported for
              non-power of 2 values until thin target version 1.5.)

       --corelog
              Specifies or changes the log type for a mirror LV.  It is an
              alias for --mirrorlog core.  (This option does not apply to
              the raid1 LV type.)

       --discards {ignore|nopassdown|passdown}
              Specifies if discards will be processed by the thin layer in
              the kernel and passed down to the Physical Volume.  This
              applies only to thin pools.  The default is passdown.  Also
              see lvmthin(7).

       -H, --cache
              Alias for --type cache.  See COMMANDS description for
              lvconvert --type cache.

       -i, --interval Seconds
              Report progress as a percentage at regular intervals.

       --merge
              Merges a snapshot that was split from an origin LV using
              --splitsnapshot, back into the origin LV.

              Merges a raid1 image that was split from a raid1 LV using
              --splitsnapshot and --trackchanges, back into the original
              raid1 LV.

              To check if the kernel supports the snapshot merge feature,
              look for "snapshot-merge" in the output of dmsetup targets.

              When merging a snapshot, if both the origin and snapshot LVs
              are not open, the merge will start immediately.  Otherwise,
              the merge will start the first time either the origin or
              snapshot LV are activated and both are closed.  Merging a
              snapshot into an origin that cannot be closed, for example a
              root filesystem, is deferred until the next time the origin
              volume is activated.  When merging starts, the resulting LV
              will have the origin's name, minor number and UUID.  While the
              merge is in progress, reads or writes to the origin appear as
              being directed to the snapshot being merged.  When the merge
              finishes, the merged snapshot is removed.  Multiple snapshots
              may be specified on the command line or a @tag may be used to
              specify multiple snapshots be merged to their respective
              origin.

       --mirrorlog {disk|core|mirrored}
              Specifies or changes the log type for a mirror LV.  The
              default is disk, which is persistent and requires a small
              amount of storage space, usually on a separate device from the
              data being mirrored.  Core may be useful for short-lived
              mirrors.  It means the mirror is regenerated by copying the
              data from the first device again every time the device is
              activated - e.g. possibly after every reboot.  Using mirrored
              will create a persistent log that is itself mirrored.  (This
              option does not apply to the raid1 LV type.)

       -m, --mirrors Number
              Specifies the number mirror images in addition to the original
              LV image, e.g. --mirrors 1 means two copies of the data, the
              original and one mirror image.

              The current maximum is 9 providing 10 raid1 images.

              This option is required when converting an LV to a raid1 or
              mirror LV.

              This option can be used alone to change the number of mirror
              images in an existing raid1 or mirror LV.

              The special case --mirrors 0 has been used historically to
              indicate a linear LV with no mirror images.

       -n, --name Name
              Specifies the name to use when the command is creating a new
              LV, e.g.  --splitmirrors.

       --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.  You should only
              use this if udev is not running or has rules that ignore the
              devices LVM creates.

       --originname NewExternalOriginVolumeName
              Specifies the name to use for the external origin LV when
              converting an LV to a thin LV.  The LV being converted becomes
              a read-only external origin with this name.
              Without this option, the default name of "lvol<n>" will be
              generated where <n> is the LVM internal number of the LV.

       --poolmetadata PoolMetadataLogicalVolume{Name|Path}
              Specifies the LV to use for thin pool metadata when converting
              an LV to a thin pool LV.
              Specifies the LV to use for cache pool metadata when
              converting an LV to a cache pool LV.
              The size should be between 2MiB and 16GiB.
              (This option can also be used when a thin pool or cache pool
              are created as an auxiliary operation within a different
              command.)  Also see lvmthin(7), and lvmcache(7).

       --poolmetadatasize PoolMetadataSize[b|B|s|S|k|K|m|M|g|G]
              Specifies the size of a cache pool metadata LV or a thin pool
              metadata LV.  This is used if a command creates a pool
              metadata LV automatically as part of the operation.  This
              option is not used when an existing LV is specified as the
              pool metadata LV, i.e. --poolmetadata.  The default unit is
              megabytes.  Also see lvmthin(7), and lvmcache(7).

       --poolmetadataspare {y|n}
              Specifies if a spare pool metadata LV should be created.  A
              spare pool metadata LV will be used for pool repair.  Only one
              spare pool metadata LV is maintained within a VG, with the
              size of the largest existing pool metadata LV.  The default is
              yes.

       -r, --readahead {ReadAheadSectors|auto|none}
              Specifies the read ahead sector count of a thin pool metadata
              LV.  The default value is auto which allows the kernel to
              choose a suitable value automatically.  None is equivalent to
              specifying zero.

       -R, --regionsize MirrorLogRegionSize
              A mirror LV is divided into regions of this size (in MB), and
              the mirror log uses this granularity to track which regions
              are in sync.  (This option does not apply to the raid1 LV
              type.)

       --repair
              Replaces failed PVs in a raid1 or mirror LV with other PVs
              available in the VG.  By default, the original number of
              mirror images will be restored if possible.  Specify -y on the
              command line to skip the prompts.  Use -f if you do not want
              any replacement.  You may use --use-policies to use the device
              replacement policy specified in lvm.conf(5), see
              activation/mirror_log_fault_policy or
              activation/mirror_device_fault_policy.

              When used with a thin pool LV, this option automates the use
              of the thin_repair(8) tool on the thin pool.  This repairs a
              very limitted number of problems.  Only inactive thin pools
              can be repaired.  There is no validation of metadata between
              kernel and LVM.  This requires further manual work.  After
              successfull repair the old unmodified metadata are still
              available in "<pool>_meta<n>" LV.  Also see lvmthin(7).

       --replace PhysicalVolume
              Remove the specified device PhysicalVolume and replace it with
              one that is available in the VG, or from a specific list of
              PVs specified on the command line following the LV name. This
              option may be repeated multiple times depending on the RaidLV
              type.

       -s, --snapshot
              Alias for --type snapshot.  See COMMANDS description for
              lvconvert --type snapshot.

       --split
              Separates SplitableLogicalVolume.  This option tries to detect
              the necessary split operation from its arguments.  Avoid using
              this option and use one of the following instead:
              --splitcache, --splitmirrors, --splitsnapshot.

       --splitcache
              Separates a cache pool from a cache LV, and keeps the unused
              cache pool LV.  Before the separation, the cache is flushed.
              See similar option --uncache.  Also see lvmcache(7).

       --splitmirrors Number
              Splits the specified number of images from a raid1 or mirror
              LV and uses them to create a new LV.

              If --trackchanges is also specified, changes to the raid1 LV
              are tracked while the split LV remains detached.  lvconvert
              --merge can be used to recombine the split images with the
              original raid1 LV.

              A name can be specified for the new LV with --name (a name is
              required without --trackchanges).

       --splitsnapshot
              Separates a COW snapshot from its origin LV.  The LV that is
              split off contains the chunks that differ from the origin LV
              along with metadata describing them.  This LV can be wiped and
              then destroyed with lvremove.  See corresponding operation
              lvconvert --type snapshot.

       --stripes Number
              Specifies the number of stripes in a striped LV.  This is the
              number of physical volumes (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 apply to existing allocated
              space, only newly allocated space can be striped.

       -I, --stripesize StripeSize
              Specifies the stripe size in kilobytes for a striped LV.  The
              stripe size is the number of kilobytes written to each stripe,
              i.e. to one device, before writing to the next stripe/device.
              StripeSize must be a power of 2 and cannot exceed the VG
              physical extent (PE) size.

       --type SegmentType
              Converts an LV from one segment type to another.  See COMMANDS
              section for a description of converting between each type.

       --thinpool ThinPoolLogicalVolume{Name|Path}
              Specifies the thin pool to use when converting an LV to a thin
              LV.  If ThinPoolLogicalVolume is not yet a thin pool, the
              command will attempt to convert it to a thin pool prior to the
              thin LV conversion.  Also see lvmthin(7).

       --trackchanges
              Can be used with --splitmirrors on a raid1 LV.  This causes
              changes to the original raid1 LV to be tracked while the split
              images remain detached.  This allows the read-only detached
              image(s) to be merged efficiently back into the raid1 LV
              later.  Only the regions with changed data are resynchronized
              during merge.  (This option only applies to the raid1 LV
              type.)

       -T, --thin
              Alias for --type thin.  See COMMANDS description for
              lvconvert --type thin.

       --uncache
              Separates a cache pool from a cache LV, and removes the unused
              cache pool LV.  Before the separation, the cache is flushed.
              See similar option --splitcache.  Also see lvmcache(7).

       -Z, --zero {y|n}
              For snapshots, this controls zeroing of the first 4KiB of data
              in the snapshot.  If the LV is read-only, the snapshot will
              not be zeroed.

              For thin pools, this controls zeroing of provisioned blocks.
              Provisioning of large zeroed chunks negatively impacts
              performance.  Also see lvmthin(7).

Examples         top

       Convert a linear LV to a two-way mirror LV:
       lvconvert --type mirror --mirrors 1 vg/lvol1

       Convert a linear LV to a two-way RAID1 LV:
       lvconvert --type raid1 --mirrors 1 vg/lvol1

       Convert a mirror LV to use an in-memory log:
       lvconvert --mirrorlog core vg/lvol1

       Convert a mirror LV to use a disk log:
       lvconvert --mirrorlog disk vg/lvol1

       Convert a mirror or raid1 LV to a linear LV:
       lvconvert --type linear vg/lvol1

       Convert a mirror LV to a raid1 LV with the same number of images:
       lvconvert --type raid1 vg/lvol1

       Convert a linear LV to a two-way mirror LV, allocating new extents
       from specific PV ranges:
       lvconvert --mirrors 1 vg/lvol1 /dev/sda:0-15 /dev/sdb:0-15

       Convert a mirror LV to a linear LV, freeing physical extents from a
       specific PV:
       lvconvert --type linear vg/lvol1 /dev/sda

       Split one image from a mirror or raid1 LV, making it a new LV:
       lvconvert --splitmirrors 1 --name lv_split vg/lvol1

       Split one image from a raid1 LV, and track changes made to the raid1
       LV while the split image remains detached:
       lvconvert --splitmirrors 1 --trackchanges vg/lvol1

       Merge an image (that was previously created with --splitmirrors and
       --trackchanges) back into the original raid1 LV:
       lvconvert --merge vg/lvol1_rimage_1

       Replace PV /dev/sdb1 with PV /dev/sdf1 in a raid1/4/5/6/10 LV:
       lvconvert --replace /dev/sdb1 vg/lvol1 /dev/sdf1

       Replace 3 PVs /dev/sd[b-d]1 with PVs /dev/sd[f-h]1 in a raid1 LV:
       lvconvert --replace /dev/sdb1 --replace /dev/sdc1 --replace /dev/sdd1
              vg/lvol1 /dev/sd[fgh]1

       Replace the maximum of 2 PVs /dev/sd[bc]1 with PVs /dev/sd[gh]1 in a
       raid6 LV:
       lvconvert --replace /dev/sdb1 --replace /dev/sdc1 vg/lvol1
       /dev/sd[gh]1

       Convert an LV into a thin LV in the specified thin pool.  The
       existing LV is used as an external read-only origin for the new thin
       LV.
       lvconvert --type thin --thinpool vg/tpool1 vg/lvol1

       Convert an LV into a thin LV in the specified thin pool.  The
       existing LV is used as an external read-only origin for the new thin
       LV, and is renamed "external":
       lvconvert --type thin --thinpool vg/tpool1
              --originname external vg/lvol1

       Convert an LV to a cache pool LV using another specified LV for cache
       pool metadata:
       lvconvert --type cache-pool --poolmetadata vg/poolmeta1 vg/lvol1

       Convert an LV to a cache LV using the specified cache pool and chunk
       size:
       lvconvert --type cache --cachepool vg/cpool1 -c 128 vg/lvol1

       Detach and keep the cache pool from a cache LV:
       lvconvert --splitcache vg/lvol1

       Detach and remove the cache pool from a cache LV:
       lvconvert --uncache vg/lvol1

SEE ALSO         top

       lvm(8), lvm.conf(5), lvmcache(7), lvmthin(7), lvdisplay(8),
       lvextend(8), lvreduce(8), lvremove(8), lvrename(8), lvscan(8),
       vgcreate(8), cache_dump(8), cache_repair(8), cache_restore(8),
       thin_dump(8), thin_repair(8), thin_restore(8)

COLOPHON         top

       This page is part of the lvm2 (Logical Volume Manager 2) project.
       Information about the project can be found at 
       ⟨http://www.sourceware.org/lvm2/⟩.  If you have a bug report for this
       manual page, send it to linux-lvm@redhat.com.  This page was obtained
       from the project's upstream Git repository 
       ⟨https://git.fedorahosted.org/git/lvm2.git⟩ on 2017-03-13.  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 man-pages@man7.org

Red Hat, Inc       LVM TOOLS 2.02.169(2)-git (2016-11-30)       LVCONVERT(8)