/usr/bin/lvconvert

  Failed to find sysfs mount point
  WARNING: Running as a non-root user. Functionality may be unavailable.
  lvconvert - Change logical volume layout

  Convert LV to linear.
  lvconvert --type linear LV
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Convert LV to striped.
  lvconvert --type striped LV
	[ -i|--interval [+]Number ]
	[ -I|--stripesize Size[k|UNIT] ]
	[ -R|--regionsize Size[m|UNIT] ]
	[    --stripes Number ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Convert LV to type mirror (also see type raid1),
  lvconvert --type mirror LV
	[ -i|--interval [+]Number ]
	[ -I|--stripesize Size[k|UNIT] ]
	[ -m|--mirrors [+|-]Number ]
	[ -R|--regionsize Size[m|UNIT] ]
	[    --mirrorlog core|disk ]
	[    --stripes Number ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Convert LV to raid or change raid layout
  (a specific raid level must be used, e.g. raid1).
  lvconvert --type raid LV
	[ -i|--interval [+]Number ]
	[ -I|--stripesize Size[k|UNIT] ]
	[ -m|--mirrors [+|-]Number ]
	[ -R|--regionsize Size[m|UNIT] ]
	[    --stripes Number ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Convert LV to raid1 or mirror, or change number of mirror images.
  lvconvert -m|--mirrors [+|-]Number LV
	[ -i|--interval [+]Number ]
	[ -R|--regionsize Size[m|UNIT] ]
	[    --mirrorlog core|disk ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Convert raid LV to change number of stripe images.
  lvconvert --stripes Number LV
	[ -i|--interval [+]Number ]
	[ -I|--stripesize Size[k|UNIT] ]
	[ -R|--regionsize Size[m|UNIT] ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Convert raid LV to change the stripe size.
  lvconvert -I|--stripesize Size[k|UNIT] LV
	[ -i|--interval [+]Number ]
	[ -R|--regionsize Size[m|UNIT] ]
	[ COMMON_OPTIONS ]

  Split images from a raid1 or mirror LV and use them to create a new LV.
  lvconvert --splitmirrors Number -n|--name LV_new LV
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Split images from a raid1 LV and track changes to origin for later merge.
  lvconvert --splitmirrors Number --trackchanges LV
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Merge LV images that were split from a raid1 LV.
  lvconvert --mergemirrors VG|LV|Tag ...
	[ COMMON_OPTIONS ]

  Convert LV to a thin LV, using the original LV as an external origin.
  lvconvert --thinpool LV --type thin LV
	[ -c|--chunksize Size[k|UNIT] ]
	[ -r|--readahead auto|none|Number ]
	[ -T|--thin ]
	[ -W|--wipesignatures y|n ]
	[ -Z|--zero y|n ]
	[    --metadataprofile String ]
	[    --originname LV_new ]
	[    --poolmetadata LV ]
	[    --poolmetadatasize Size[m|UNIT] ]
	[    --poolmetadataspare y|n ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Convert LV to a thin LV, using LV as thin-pool data volume.
  lvconvert --type thin LV
	[ -c|--chunksize Size[k|UNIT] ]
	[ -r|--readahead auto|none|Number ]
	[ -T|--thin ]
	[ -W|--wipesignatures y|n ]
	[ -Z|--zero y|n ]
	[    --metadataprofile String ]
	[    --poolmetadata LV ]
	[    --poolmetadatasize Size[m|UNIT] ]
	[    --poolmetadataspare y|n ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Attach a cache pool to an LV, converting the LV to type cache.
  lvconvert --cachepool LV --type cache LV
	[ -c|--chunksize Size[k|UNIT] ]
	[ -H|--cache ]
	[ -r|--readahead auto|none|Number ]
	[ -W|--wipesignatures y|n ]
	[ -Z|--zero y|n ]
	[    --cachemetadataformat auto|1|2 ]
	[    --cachemode writethrough|writeback|passthrough ]
	[    --cachepolicy String ]
	[    --cachesettings String ]
	[    --metadataprofile String ]
	[    --poolmetadata LV ]
	[    --poolmetadatasize Size[m|UNIT] ]
	[    --poolmetadataspare y|n ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Attach a writecache to an LV, converting the LV to type writecache.
  lvconvert --cachevol LV --type writecache LV
	[    --cachesettings String ]
	[ COMMON_OPTIONS ]

  Attach a cache to an LV, converting the LV to type cache.
  lvconvert --cachevol LV --type cache LV
	[ -c|--chunksize Size[k|UNIT] ]
	[ -H|--cache ]
	[ -Z|--zero y|n ]
	[    --cachemetadataformat auto|1|2 ]
	[    --cachemode writethrough|writeback|passthrough ]
	[    --cachepolicy String ]
	[    --cachesettings String ]
	[    --poolmetadatasize Size[m|UNIT] ]
	[ COMMON_OPTIONS ]

  Add a writecache to an LV, using a specified cache device.
  lvconvert --cachedevice PV --type writecache LV
	[    --cachesettings String ]
	[    --cachesize Size[m|UNIT] ]
	[ COMMON_OPTIONS ]

  Add a cache to an LV, using a specified cache device.
  lvconvert --cachedevice PV --type cache LV
	[ -c|--chunksize Size[k|UNIT] ]
	[    --cachesettings String ]
	[    --cachesize Size[m|UNIT] ]
	[ COMMON_OPTIONS ]

  Convert LV to type thin-pool (existing data on LV will be erased).
  lvconvert --type thin-pool LV
	[ -c|--chunksize Size[k|UNIT] ]
	[ -I|--stripesize Size[k|UNIT] ]
	[ -r|--readahead auto|none|Number ]
	[ -W|--wipesignatures y|n ]
	[ -Z|--zero y|n ]
	[    --compression y|n ]
	[    --deduplication y|n ]
	[    --discards passdown|nopassdown|ignore ]
	[    --errorwhenfull y|n ]
	[    --metadataprofile String ]
	[    --pooldatavdo y|n ]
	[    --poolmetadata LV ]
	[    --poolmetadatasize Size[m|UNIT] ]
	[    --poolmetadataspare y|n ]
	[    --stripes Number ]
	[    --vdosettings String ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Convert LV to type cache-pool (existing data on LV will be erased).
  lvconvert --type cache-pool LV
	[ -c|--chunksize Size[k|UNIT] ]
	[ -r|--readahead auto|none|Number ]
	[ -W|--wipesignatures y|n ]
	[ -Z|--zero y|n ]
	[    --cachemetadataformat auto|1|2 ]
	[    --cachemode writethrough|writeback|passthrough ]
	[    --cachepolicy String ]
	[    --cachesettings String ]
	[    --metadataprofile String ]
	[    --poolmetadata LV ]
	[    --poolmetadatasize Size[m|UNIT] ]
	[    --poolmetadataspare y|n ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Convert LV to type vdopool (existing data on LV will be erased).
  lvconvert --type vdo-pool LV
	[ -n|--name LV_new ]
	[ -r|--readahead auto|none|Number ]
	[ -V|--virtualsize Size[m|UNIT] ]
	[ -W|--wipesignatures y|n ]
	[ -Z|--zero y|n ]
	[    --compression y|n ]
	[    --deduplication y|n ]
	[    --metadataprofile String ]
	[    --vdosettings String ]
	[ COMMON_OPTIONS ]

  Detach a cache from an LV.
  lvconvert --splitcache LV
	[    --cachesettings String ]
	[ COMMON_OPTIONS ]

  Merge thin LV into its origin LV.
  lvconvert --mergethin LV ...
	[ COMMON_OPTIONS ]

  Merge COW snapshot LV into its origin.
  lvconvert --mergesnapshot LV ...
	[ -i|--interval [+]Number ]
	[ COMMON_OPTIONS ]

  Combine a former COW snapshot (second arg) with a former
  origin LV (first arg) to reverse a splitsnapshot command.
  lvconvert --type snapshot LV LV
	[ -c|--chunksize Size[k|UNIT] ]
	[ -s|--snapshot ]
	[ -Z|--zero y|n ]
	[ COMMON_OPTIONS ]

  Replace failed PVs in a raid or mirror LV.
  Repair a thin pool.
  Repair a cache pool.
  lvconvert --repair LV
	[ -i|--interval [+]Number ]
	[ -k|--setactivationskip y|n ]
	[    --poolmetadataspare y|n ]
	[    --usepolicies ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Replace specific PV(s) in a raid LV with another PV.
  lvconvert --replace PV LV
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Poll LV to continue conversion.
  lvconvert --startpoll LV
	[ COMMON_OPTIONS ]

  Add or remove data integrity checksums to raid images.
  lvconvert --raidintegrity y|n LV
	[    --integritysettings String ]
	[    --raidintegrityblocksize Number ]
	[    --raidintegritymode String ]
	[ COMMON_OPTIONS ]
	[ PV ... ]

  Common options for command:
	[ -b|--background ]
	[ -f|--force ]
	[    --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit ]
	[    --noudevsync ]

  Common options for lvm:
	[ -d|--debug ]
	[ -h|--help ]
	[ -q|--quiet ]
	[ -v|--verbose ]
	[ -y|--yes ]
	[ -t|--test ]
	[    --commandprofile String ]
	[    --config String ]
	[    --driverloaded y|n ]
	[    --nolocking ]
	[    --lockopt String ]
	[    --longhelp ]
	[    --profile String ]
	[    --version ]
	[    --devicesfile String ]
	[    --devices PV ]
	[    --nohints ]
	[    --journal String ]

  Use --longhelp to show all options and advanced commands.