# Pastebin k50bZxcY
root@t0:~# python2.7 x.py
device node not found
Traceback (most recent call last):
  File "x.py", line 79, in <module>
    gather_physical_block_devices()
  File "x.py", line 48, in gather_physical_block_devices
    ("udevadm", "info", "-q", "all", "-n", block_name))
  File "/usr/lib/python2.7/subprocess.py", line 573, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '('udevadm', 'info', '-q', 'all', '-n', 'cciss!c0d0')' returned non-zero exit status 2
root@t0:~#