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    Command:

    lvconvert

    
    
    

    SYNOPSIS

           lvconvert   -m|--mirrors   Mirrors  [--mirrorlog  {disk|core|mirrored}]
           [--corelog] [-R|--regionsize MirrorLogRegionSize]  [-A|--alloc  Alloca-
           tionPolicy]   [-b|--background]  [-f|--force]  [-i|--interval  Seconds]
           [-h|-?|--help]   [--stripes   Stripes   [-I|--stripesize   StripeSize]]
           [--noudevsync] [-v|--verbose] [-y|--yes] [--version]
           LogicalVolume[Path] [PhysicalVolume[Path][:PE[-PE]]...]
    
           lvconvert --splitmirrors Images --name SplitLogicalVolumeName
           MirrorLogicalVolume[Path] [SplittablePhysicalVolume[Path][:PE[-PE]]...]
    
           lvconvert  -s|--snapshot  [-c|--chunksize   ChunkSize]   [-h|-?|--help]
           [--noudevsync] [-v|--verbose] [-Z|--zero y|n] [--version]
           OriginalLogicalVolume[Path] SnapshotLogicalVolume[Path]
    
           lvconvert    --merge    [-b|--background]    [-i|--interval    Seconds]
           [-h|-?|--help]    [-v|--verbose]    [--version]     SnapshotLogicalVol-
           ume[Path]...
    
           lvconvert  --repair  [-h|-?|--help]  [-v|--verbose]  [--version]  Logi-
           calVolume[Path] [PhysicalVolume[Path]...]
    
    
    

    DESCRIPTION

           lvconvert will change a linear logical volume to a mirror logical  vol-
           ume  or to a snapshot of linear volume and vice versa.  It is also used
           to add and remove disk logs from mirror devices.
           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.
    
    
    

    OPTIONS

           See lvm for common options.
           Exactly  one  of  --splitmirrors,  --mirrors,  --repair,  --snapshot or
           --merge arguments is required.
    
           -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.
    
           --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
                  Run the daemon in the background.
    
           -i, --interval Seconds
                  Report progress as a percentage at regular intervals.
    
           --noudevsync
                  Disable  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.
    
           -n Name
                  The  name  to apply to a logical volume which has been split off
                  from a mirror logical volume.
    
           -s, --snapshot
                  Create a snapshot from existing  logical  volume  using  another
                  existing logical volume as its origin.
    
           -c, --chunksize ChunkSize
                  Power of 2 chunk size for the snapshot logical volume between 4k
                  and 512k.
    
           -Z, --zero y|n
                  Controls zeroing of the first KB of data in  the  snapshot.   If
                  the volume is read-only the snapshot will not be zeroed.
    
           --merge
                  Merges a snapshot into its origin volume. 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  snap-
                  shot  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 snapshot being merged.  When the merge
                  finishes,  the  merged  snapshot is removed.  Multiple snapshots
                  may be specified on the commandline or a @tag  may  be  used  to
                  specify multiple snapshots be merged to their respective origin.
    
           "lvconvert -m1 vg00/lvol1"
           converts  the  linear  logical  volume "vg00/lvol1" to a two-way mirror
           logical volume.
    
           "lvconvert --mirrorlog core vg00/lvol1"
           converts a mirror with a disk log to a mirror with an in-memory log.
    
           "lvconvert --mirrorlog disk vg00/lvol1"
           converts a mirror with an in-memory log to a mirror with a disk log.
    
           "lvconvert -m0 vg00/lvol1"
           converts a mirror logical volume to a linear logical volume.
    
           "lvconvert -s vg00/lvol1 vg00/lvol2"
           converts logical volume "vg00/lvol2" to  snapshot  of  original  volume
           "vg00/lvol1"
    
           "lvconvert -m1 vg00/lvol1 /dev/sda:0-15 /dev/sdb:0-15"
           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
           extents.
    
           "lvconvert -m0 vg00/lvmirror1 /dev/sda
           converts  mirror  logical  volume  "vg00/lvmirror1"  to linear, freeing
           physical extents from /dev/sda.
    
           "lvconvert --merge vg00/lvol1_snap"
           merges "vg00/lvol1_snap" into its origin.
    
           "lvconvert --merge @some_tag"
           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 parallel.
    
    
    

    SEE ALSO

           lvm(8),   vgcreate(8),  lvremove(8),  lvrename(8),  lvextend(8),  lvre-
           duce(8), lvdisplay(8), lvscan(8)
    
    
    

    Red Hat, Inc LVM TOOLS 2.02.66(2) (2010-05-20) LVCONVERT(8)

    
    
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