docs: def diskdata():
      """Get total disk size in GB."""
      p = os.popen("/bin/df -l -P")
      ddata = {}
      tsize = 0
      for line in p.readlines():
          d = line.split()
          if ("/dev/sd" in d[0] or "/dev/hd" in d[0] or "/dev/mapper" in d[0]):
              tsize = tsize + int(d[1])
      ddata["Disk_GB"] = int(tsize)/1000000
      p.close()
      return ddata