LVCONVERT man page on Archlinux

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       lvconvert - convert a logical volume from linear to mirror or snapshot

       lvconvert   -m|--mirrors	  Mirrors  [--mirrorlog	 {disk|core|mirrored}]
       [--corelog] [-R|--regionsize MirrorLogRegionSize] [--type  SegmentType]
       [-A|--alloc     AllocationPolicy]     [-b|--background]	  [-f|--force]
       [-i|--interval Seconds] [-h|-?|--help] [--stripes Stripes [-I|--stripe‐
       size  StripeSize]] [--noudevsync] [-v|--verbose] [-y|--yes] [--version]
       LogicalVolume[Path] [PhysicalVolume[Path][:PE[-PE]]...]

       lvconvert   --splitmirrors   Images   [--name   SplitLogicalVolumeName]
       [--trackchanges]	   MirrorLogicalVolume[Path]   [SplittablePhysicalVol‐

       lvconvert --splitsnapshot [-h|-?|--help] [--noudevsync]	[-v|--verbose]
       [--version] SnapshotLogicalVolume[Path]

       lvconvert      -s|--snapshot	[-c|--chunksize	    ChunkSize[bBsSkK]]
       [-h|-?|--help] [--noudevsync] [-v|--verbose] [-Z|--zero {y|n}]  [--ver‐
       sion] OriginalLogicalVolume[Path] SnapshotLogicalVolume[Path]

       lvconvert    --merge    [-b|--background]    [-i|--interval    Seconds]
       [-h|-?|--help] [-v|--verbose] [--version] LogicalVolume[Path]...

       lvconvert --repair [-h|-?|--help] [--stripes  Stripes  [-I|--stripesize
       StripeSize]]  [-v|--verbose]  [--version]  LogicalVolume[Path]  [Physi‐

       lvconvert  --replace   PhysicalVolume   [-h|-?|--help]	[-v|--verbose]
       [--version] LogicalVolume[Path] [PhysicalVolume[Path]...]

       lvconvert  --thinpool  ThinPoolLogicalVolume{Name|Path} [-c|--chunksize
       ChunkSize[bBsSkKmMgG]]	 [--discards	 {ignore|nopassdown|passdown}]
       [{--poolmetadata ThinPoolMetadataLogicalVolume{Name|Path} | --poolmeta‐
       datasize ThinPoolMetadataSize[bBsSkKmMgG]}] [-r|--readahead {ReadAhead‐
       Sectors|auto|none}]  [--stripes	Stripes [-I|--stripesize StripeSize]]]
       [-Z|--zero  {y|n}]  [-T|--thin	ExternalOriginLogicalVolume{Name|Path}
       [--originname	    NewExternalOriginVolumeName]]	 [PhysicalVol‐
       ume[Path][:PE[-PE]]...]	[-h|-?|--help] [-v|--verbose] [--version]

       lvconvert  --type  cache-pool  [-c|--chunksize	ChunkSize[bBsSkKmMgG]]
       [--cachemode  {writeback|writethrough}] [{--poolmetadata CachePoolMeta‐
       dataLogicalVolume{Name|Path}  |	--poolmetadatasize  CachePoolMetadata‐
       Size[bBsSkKmMgG]}]	    LogicalVolume[Path]		 [PhysicalVol‐
       ume[Path][:PE[-PE]]...]	[-h|-?|--help] [-v|--verbose] [--version]

       lvconvert --type cache --cachepool  CachePoolLV{Name|Path}  LogicalVol‐
       ume[Path] [-h|-?|--help] [-v|--verbose] [--version]

       lvconvert is used to change the segment type (i.e. linear, mirror, etc)
       or characteristics of a logical volume.	For example,  it  can  add  or
       remove the redundant images of a logical volume, change the log type of
       a mirror, or designate a logical volume as a snapshot repository.
       If the conversion requires allocation of physical extents (for example,
       when  converting	 from  linear  to  mirror) and you specify one or more
       PhysicalVolumes (optionally with ranges of physical  extents),  alloca‐
       tion  of physical extents will be restricted to these physical extents.
       If the conversion frees physical extents (for example, when  converting
       from a mirror to a linear, or reducing mirror legs) and you specify one
       or more PhysicalVolumes, the freed extents come first from  the	speci‐
       fied PhysicalVolumes.

       See lvm(8) for common options.
       Exactly	one  of	 --merge, --mirrors, --repair, --replace, --splitsnap‐
       shot, --snapshot, --splitmirrors or --thinpool arguments is required.

       -b, --background
	      Run the daemon in the background.

       --cachepool achePoolLV
	      This argument is necessary when converting a logical volume to a
	      cache LV.	 For more information on cache pool LVs and cache LVs,
	      see lvm(8).

       -m, --mirrors Mirrors
	      Specifies the degree of the mirror  you  wish  to	 create.   For
	      example,	"-m  1" would convert the original logical volume to a
	      mirror volume with 2-sides; that is, a linear  volume  plus  one
	      copy.   There  are two implementations of mirroring which corre‐
	      spond to the "raid1" and "mirror" segment	 types.	  The  default
	      mirroring	 segment type is "raid1".  If the legacy "mirror" seg‐
	      ment type is desired,  the  --type  argument  must  be  used  to
	      explicitly   select  the	desired	 type.	 The  --mirrorlog  and
	      --corelog options below are only relevant to the legacy "mirror"
	      segment type.

       --mirrorlog {disk|core|mirrored}
	      Specifies the type of log to use.	 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  regener‐
	      ated  by copying the data from the first device again every time
	      the device is activated -	 perhaps,  for	example,  after	 every
	      reboot.	Using  mirrored	 will  create a persistent log that is
	      itself mirrored.

	      The optional argument --corelog is the same as specifying --mir‐
	      rorlog core.

       -R, --regionsize MirrorLogRegionSize
	      A	 mirror	 is divided into regions of this size (in MB), and the
	      mirror log uses this granularity to track which regions  are  in

       --type SegmentType
	      Used  to	convert a logical volume to another segment type, like
	      cache-pool, cache, raid1, or thin-pool.  When converting a logi‐
	      cal volume to a cache LV, the --cachepool argument is required.

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

	      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
	      LVM2 creates.

       --splitmirrors Images
	      The  number  of redundant Images of a mirror to be split off and
	      used to form a new logical volume.  A name must be supplied  for
	      the  newly-split-off  logical  volume using the --name argument,
	      unless the --trackchanges argument is given.

       -n, --name Name
	      The name to apply to a logical volume which has been  split  off
	      from a mirror logical volume.

	      Used  with --splitmirrors on a raid1 device, this tracks changes
	      so that the read-only detached image can be  merged  efficiently
	      back  into  the  mirror  later. Only the regions of the detached
	      device where the data changed get resynchronized.

	      Please note that this feature is only supported with the new md-
	      based  mirror  implementation  and not with the original device-
	      mapper mirror implementation.

	      Separates SnapshotLogicalVolume from  its	 origin.   The	volume
	      that  is split off contains the chunks that differ from the ori‐
	      gin along with the metadata describing them.  This volume can be
	      wiped  and then destroyed with lvremove.	The inverse of --snap‐

       -s, --snapshot
	      Recreates a snapshot from constituent logical volumes (or copies
	      of them) after having been separated using --splitsnapshot.  For
	      this to work correctly, no changes may be made to	 the  contents
	      of either volume after the split.

       -c, --chunksize ChunkSize[bBsSkKmMgG]
	      Gives  the size of chunk for snapshot and thin pool logical vol‐
	      umes.  Default unit is in kilobytes.
	      For snapshots the value must be power  of	 2  between  4KiB  and
	      512KiB and the default value is 4.
	      For  thin pools the value must be between 64KiB and 1GiB and the
	      default value starts with 64 and scales up to fit the pool meta‐
	      data size within 128MiB, if the pool metadata size is not speci‐
	      fied.  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 weren't supported for non-power of 2  val‐
	      ues  until  thin	target version 1.5.)  Default unit is in kilo‐

       --discards {ignore|nopassdown|passdown}
	      Specifies whether or not discards will be processed by the  thin
	      layer  in	 the  kernel  and  passed down to the Physical Volume.
	      Default is passdown.

       -Z, --zero {y|n}
	      Controls zeroing of the first 4KiB of data in the snapshot.   If
	      the  volume  is  read-only the snapshot will not be zeroed.  For
	      thin pool volumes it controls  zeroing  of  provisioned  blocks.
	      Note: Provisioning of large zeroed chunks impacts performance.

	      Merges a snapshot into its origin volume or merges a raid1 image
	      that has been split from its  mirror  with  --trackchanges  back
	      into its mirror.

	      To  check	 if  your  kernel supports the snapshot merge feature,
	      look for 'snapshot-merge' in the output of dmsetup targets.   If
	      both  the origin and snapshot volume are not open the merge will
	      start immediately.  Otherwise, the merge will  start  the	 first
	      time  either  the	 origin or snapshot 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 logical volume will have the origin's name, minor
	      number and UUID.	While the  merge  is  in  progress,  reads  or
	      writes  to  the origin appear as they were directed to the snap‐
	      shot 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.

       --originname NewExternalOriginVolumeName
	      The new name for original logical volume, which becomes external
	      origin volume.
	      Without this option a default names of "lvol#" will be generated
	      where  # is the LVM internal number of the logical volume.  This
	      volume will be read-only and cannot be further modified as long,
	      as it is being used as external origin.

       --poolmetadata ThinPoolMetadataLogicalVolume{Name|Path}
	      Specifies thin pool metadata logical volume.  The size should be
	      in between 2MiB and 16GiB.  Thin	pool  is  specified  with  the
	      option --thinpool.  When the specified thin pool already exists,
	      the thin pool's metadata volume will be swapped with  the	 given
	      LV.   Properties	of  the thin pool like chunk size, discards or
	      zero are preserved by default in this case.  It  can  be	useful
	      for  thin	 pool metadata repair or its offline resize, since the
	      content of metadata becomes  accessible  for  thin  provisioning
	      tools thin_dump(8) and thin_restore(8).

       --poolmetadatasize ThinPoolMetadataSize[bBsSkKmMgG]
	      Sets  the	 size  of  thin pool's metadata logical volume, if the
	      pool metadata volume is undefined.  Thin pool is specified  with
	      the  option --thinpool.  Supported value is in the range between
	      2MiB and 16GiB.  The default value is estimated with  this  for‐
	      mula (Pool_LV_size / Pool_LV_chunk_size * 64b).  Default unit is

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

	      Repair  a	 mirror	 after	suffering a disk failure or try to fix
	      thin pool metadata.

	      The mirror will be brought back into  a  consistent  state.   By
	      default, the original number of mirrors will be restored if pos‐
	      sible.  Specify -y on the command line to skip the prompts.  Use
	      -f  if  you  do not want any replacement.	 Additionally, you may
	      use --use-policies to use the device replacement	policy	speci‐
	      fied  in lvm.conf(5), viz. activation/mirror_log_fault_policy or

	      Thin pool repair automates the use of thin_repair(8) tool.  Only
	      inactive thin pool volumes can be repaired.  There is no valida‐
	      tion of metadata between kernel and lvm2.	 This requires further
	      manual  work.  After successfull repair the old unmodified meta‐
	      data are still available in <pool>_tmeta<n> LV.

       --replace PhysicalVolume
	      Remove the specified device (PhysicalVolume) and replace it with
	      one  that	 is available in the volume group or from the specific
	      list provided.  This option is only available  to	 RAID  segment
	      types (e.g. "raid1", "raid5", etc).

       --stripes Stripes
	      Gives  the  number  of  stripes.	This is equal to the number of
	      physical volumes to scatter the logical volume.  This  does  not
	      apply  to	 existing  allocated space, only newly allocated space
	      can be striped.

       -I, --stripesize StripeSize
	      Gives the	 number	 of  kilobytes	for  the  granularity  of  the
	      StripeSize must be 2^n (n = 2 to 9) for metadata in LVM1 format.
	      For metadata in LVM2 format, the stripe size  may	 be  a	larger
	      power of 2 but must not exceed the physical extent size.

       -T, --thin ExternalOriginLogicalVolume{Name|Path}
	      Converts	the  logical  volume into a thin logical volume of the
	      thin pool specified with --thinpool. The original logical volume
	      ExternalOriginLogicalVolume is renamed into a new read-only log‐
	      ical volume.  The non-default name for this volume use --origin‐
	      name.   The  volume  cannot be further modified as long as it is
	      used as an external origin volume for unprovisioned areas of any
	      thin logical volume.

       --thinpool ThinPoolLogicalVolume{Name|Path}
	      Changes  logical volume into a thin pool volume. The volume will
	      store the pool's data.  Thin pool metadata logical volume can be
	      specified	 with  the  option  --poolmetadata  or	allocated with

       Converts the linear logical volume "vg00/lvol1"	to  a  two-way	mirror
       logical volume:

       lvconvert -m1 vg00/lvol1

       Converts the linear logical volume "vg00/lvol1" to a two-way RAID1 log‐
       ical volume:

       lvconvert --type raid1 -m1 vg00/lvol1

       Converts a mirror with a disk log to a mirror with an in-memory log:

       lvconvert --mirrorlog core vg00/lvol1

       Converts a mirror with an in-memory log to a mirror with a disk log:

       lvconvert --mirrorlog disk vg00/lvol1

       Converts a mirror logical volume to a linear logical volume:

       lvconvert -m0 vg00/lvol1

       Converts a mirror logical volume to a RAID1  logical  volume  with  the
       same number of images:

       lvconvert --type raid1 vg00/mirror_lv

       Converts	 logical  volume  "vg00/lvol2"	to snapshot of original volume

       lvconvert -s vg00/lvol1 vg00/lvol2

       Converts linear logical volume "vg00/lvol1" to a two-way mirror,	 using
       physical	 extents /dev/sda:0-15 and /dev/sdb:0-15 for allocation of new

       lvconvert -m1 vg00/lvol1 /dev/sda:0-15 /dev/sdb:0-15

       Converts mirror logical	volume	"vg00/lvmirror1"  to  linear,  freeing
       physical extents from /dev/sda:

       lvconvert -m0 vg00/lvmirror1 /dev/sda

       Merges "vg00/lvol1_snap" into its origin:

       lvconvert --merge vg00/lvol1_snap

       If  "vg00/lvol1",  "vg00/lvol2"	and  "vg00/lvol3"  are all tagged with
       "some_tag" each snapshot logical volume will be merged serially,	 e.g.:
       "vg00/lvol1",  then  "vg00/lvol2",  then "vg00/lvol3".  If --background
       were used it would start all snapshot logical volume merges  in	paral‐

       lvconvert --merge @some_tag

       Extracts	 one  image  from  the	mirror, making it a new logical volume
       named "lv_split".  The mirror the image is extracted  from  is  reduced
       accordingly.   If it was a 2-way mirror (created with '-m 1'), then the
       resulting original volume will be linear.

       lvconvert --splitmirrors 1 --name lv_split vg00/lvmirror1

       A mirrored logical  volume  created  with  --type  raid1	 can  use  the
       --trackchanges  argument when splitting off an image.  Detach one image
       from the mirrored logical  volume  lv_raid1  as	a  separate  read-only
       device  and  track the changes made to the mirror while it is detached.
       The split-off device has a name of the form lv_raid1_rimage_N, where  N
       is a number, and it cannot be renamed.

       lvconvert --splitmirrors 1 --trackchanges vg00/lv_raid1

       Merge  an  image that was detached temporarily from its mirror with the
       --trackchanges argument back into its original  mirror  and  bring  its
       contents back up-to-date.

       lvconvert --merge vg00/lv_raid1_rimage_1

       Replaces	 the  physical	volume "/dev/sdb1" in the RAID1 logical volume
       "my_raid1" with the specified physical  volume  "/dev/sdf1".   Had  the
       argument	 "/dev/sdf1"  been left out, lvconvert would attempt to find a
       suitable device from those available in the volume group.

       lvconvert --replace /dev/sdb1 vg00/my_raid1 /dev/sdf1

       Convert the logical volume "vg00/lvpool" into a thin  pool  with	 chunk
       size  128KiB and convert "vg00/lv1" into a thin volume using this pool.
       Original "vg00/lv1" is used as an external read-only origin, where  all
       writes to such volume are stored in the "vg00/lvpool".

       lvconvert --thinpool vg00/lvpool -c 128 -T lv1

       Convert	the  logical  volume "vg00/origin" into a thin volume from the
       thin pool "vg00/lvpool". This thin volume will use "vg00/origin" as  an
       external origin volume for unprovisioned areas in this volume.  For the
       read-only external origin use the new name "vg00/external".

       lvconvert --thinpool vg00/lvpool --originname external -T vg00/origin

       Convert an existing logical volume to a cache pool LV using  the	 given
       cache metadata LV.

       lvconvert --type cache-pool --poolmetadata vg00/lvx_meta vg00/lvx_data
       lvrename vg00/lvx_data vg00/lvx_cachepool

       Convert	an existing logical volume to a cache LV using the given cache
       pool LV.

       lvconvert --type cache --cachepool vg00/lvx_cachepool vg00/lvx

       lvm(8),	lvm.conf(5),  lvdisplay(8),  lvextend(8),  lvreduce(8),	 lvre‐
       move(8),	   lvrename(8),	   lvscan(8),	 vgcreate(8),	 thin_dump(8),
       thin_repair(8) thin_restore(8)

Red Hat, Inc	      LVM TOOLS 2.02.106(2) (2014-04-10)	  LVCONVERT(8)

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