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lvconvert

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] [-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 "--log 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.

-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 --log core vg00/lvol1"
converts a mirror with a disk log to a mirror with an in-memory log.

"lvconvert --log 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)