Linux, Ramdisk.
extended # vgscan --cache Reading volume groups from cache. Found volume group "ol" using metadata type lvm2 # lvconvert -y -m 1 ol/root /dev/zram0 Logical volume ol/root successfully converted. # lvs -a -o +devices LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Devices root ol