lvconvert

converts or modifies the type, redundancy, or state of logical volumes

TLDR

Convert to RAID1

$ sudo lvconvert --type raid1 -m 1 /dev/vg_name/lv_name

Remove mirroring (convert to linear)

$ sudo lvconvert -m 0 /dev/vg_name/lv_name

Merge snapshot into origin

$ sudo lvconvert --merge /dev/vg_name/snapshot_lv

Repair degraded RAID

$ sudo lvconvert --repair /dev/vg_name/lv_name

Convert to thin pool

$ sudo lvconvert --type thin-pool --poolmetadata /dev/vg_name/meta_lv /dev/vg_name/pool_lv

SYNOPSIS

lvconvert [options] vg/lv

DESCRIPTION

lvconvert converts or modifies the type, redundancy, or state of logical volumes. It can add/remove mirrors, convert between linear and RAID, merge snapshots, and convert to thin pools.

PARAMETERS

--type TYPE

Convert to specified type (raid1, linear, thin-pool, cache-pool)

-m, --mirrors N

Number of mirrors (0 removes mirroring)

--merge

Merge snapshot back into origin

--repair

Repair degraded RAID volume

--poolmetadata LV

Specify metadata LV for thin pool

--stripes N

Number of stripes for conversion

CAVEATS

Requires root privileges. Data migration may take time. Snapshot merge applies on next activation.