lvreduce

Reduce the size of a logical volume

TLDR

Reduce volume to specific size

$ sudo lvreduce -L 120G [logical_volume]

Reduce by amount with filesystem resize

$ sudo lvreduce -L -40G --resizefs [logical_volume]

Reduce by a number of logical extents

$ sudo lvreduce -l -3 [vg00/lvol1]

Test a reduction without applying changes

$ sudo lvreduce -t -L -10G [logical_volume]

SYNOPSIS

lvreduce [options] {-L|-l} [-]size lv

lvreduce reduces the size of a logical volume. The freed logical extents are returned to the volume group to be used by other logical volumes. This is a destructive operation -- data in the reduced area is lost.You should ensure that any filesystem on the volume is resized before running lvreduce so that the extents to be removed are not in use, unless using the --resizefs option.

PARAMETERS

-L, --size SIZE[k|m|g|t]

New absolute size, or with a leading minus sign, the amount to subtract from the current size. Accepts size suffixes: k (KiB), m (MiB), g (GiB), t (TiB).

-l, --extents [-]Number[%{VG|FREE|PVS|ORIGIN}]

New size in logical extents, or relative reduction with minus prefix. Supports percentage suffixes: %VG (of VG size), %FREE (of VG free space), %PVS (of specified PVs).

-r, --resizefs

Resize the underlying filesystem together with the logical volume using fsadm(8).

-f, --force

Force size reduction without prompting, even when it may cause data loss.

-n, --nofsck

Skip the filesystem check before resizing.

-y, --yes

Do not prompt for confirmation; always assume yes.

-t, --test

Run in test mode; commands will not update metadata.

-A, --autobackup {y|n}

Automatically back up metadata after a change.

CAVEATS

Data loss risk: Always back up before reducing. The filesystem must be reduced first unless using --resizefs. Shrinking is not supported on XFS or GFS2 filesystems. Only ext2/ext3/ext4 can be reduced with --resizefs.