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.
--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.
-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.
-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 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"
converts a two-way mirror with a disk log to a
two-way mirror with an in-memory 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"
