public static function getDiskUsage()
    {
        $result = [];
        $lines = explode("\n", trim(shell_exec('df')));
        array_shift($lines);
        foreach ($lines as &$line) {
            if (0 === strpos($line, '/')) {
                $result[] = explode("\t", $line);
            }
        }

        return $result;
    }