/dev/mapper and vicious IO widget

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http://unix.stackexchange.com – I have dio vicious widget for monitoring IO within an awesome widget. It is defined like so: diowidget = widget({ type = "textbox" }) vicious.register(diowidget, vicious.widgets.dio, '<span color="#4682b4">${sda read_mb}</span>/<span color="#bf3eff">${sda write_mb}</span>', 3) However, my hard disk uses lvm and looks like: ; df -h Filesystem Size Used Avail Use% Mounted on rootfs 50G 8.0G 40G 17% / devtmpfs 2.0G 0 2.0G 0% /dev tmpfs 2.0G 1.8M 2 (HowTos)