lvm2/man/lvconvert.8

.TH LVCONVERT 8 "LVM TOOLS" "Red Hat, Inc" \" -*- nroff -*-
.SH NAME
lvconvert \- convert a logical volume between linear and mirror
.SH SYNOPSIS
.B lvconvert
[\-m/\-\-mirrors Mirrors [\-\-corelog] [\-R/\-\-regionsize MirrorLogRegionSize]]
[\-A/\-\-alloc AllocationPolicy]
[\-h/\-?/\-\-help]
[\-v/\-\-verbose]
[\-\-version]
LogicalVolume[Path] [PhysicalVolume[Path]...]
.SH DESCRIPTION
lvconvert will change a linear logical volume to a mirror
logical volume or vis versa.  It is also used to add and
remove disk logs from mirror devices.
.SH OPTIONS
See \fBlvm\fP for common options.
.TP
.I \-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.
.TP
.I \-\-corelog
This optional argument tells lvconvert to switch the
mirror from using a disk-based (persistent) log to
an in-memory log.  You may only specify this option
when the \-\-mirror argument is the same degree of
the mirror you are changing.
.TP
.I \-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.
.SH Examples
"lvconvert -m1 vg00/lvol1"
.br
converts the linear logical volume "vg00/lvol1" to
a mirror logical volume.  This command could also
be used to convert a two-way mirror with an
in-memory log to a two-way mirror with a disk log.

"lvconvert -m1 --corelog vg00/lvol1"
.br
converts a two-way mirror with a disk log to a
two-way mirror with an in-memory log.

"lvconvert -m0 vg00/lvol1"
.br
converts a mirror logical volume to a linear logical
volume.

.SH SEE ALSO
.BR lvm (8),
.BR vgcreate (8),
.BR lvremove (8),
.BR lvrename (8),
.BR lvextend (8),
.BR lvreduce (8),
.BR lvdisplay (8),
.BR lvscan (8)