добавить место в логический том (Add space to a logical volume)
Примеры (Examples)
Extend the size of an LV by 54MiB, using a specific PV.
lvextend -L +54 vg01/lvol10 /dev/sdk3
Extend the size of an LV by the amount of free space on PV
/dev/sdk3. This is equivalent to specifying "-l +100%PVS" on the
command line.
lvextend vg01/lvol01 /dev/sdk3
Extend an LV by 16MiB using specific physical extents.
lvextend -L+16m vg01/lvol01 /dev/sda:8-9 /dev/sdb:8-9
Extend an LV to use all remaining free space in volume group and
all resize its filesystem with fsadm(8).
lvextend -l+100%FREE -r vg01/lvol01