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

NAME

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

SYNOPSIS

       lvconvert  -m|--mirrors	Mirrors  [--mirrorlog {disk|core}] [--corelog] [-R|--regionsize MirrorLogRegionSize] [-A|--alloc AllocationPolicy]
       [-b|--background] [-i|--interval Seconds] [-h|-?|--help] [-v|--verbose] [--version]
       LogicalVolume[Path] [PhysicalVolume[Path]...]

       lvconvert -s|--snapshot [-c|--chunksize ChunkSize] [-h|-?|--help] [-v|--verbose] [-Z|--zero y|n] [--version]
       OriginalLogicalVolume[Path] SnapshotLogicalVolume[Path]

DESCRIPTION

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

OPTIONS

       See lvm for common options.
       Exactly one of --mirrors or --snapshot arguments 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}
	      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 regenerated by
	      copying the data from the first device again every time the device is activated - perhaps, for example, after every reboot.

       --corelog
	      The optional argument "--corelog" is the same as specifying "--mirrorlog 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 sync.

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

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

       -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.

Examples
       "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"

SEE ALSO

       lvm(8), vgcreate(8), lvremove(8), lvrename(8), lvextend(8), lvreduce(8), lvdisplay(8), lvscan(8)

Red Hat, Inc						 LVM TOOLS 2.02.44-cvs (02-17-09)					      LVCONVERT(8)