Simple temperature dump of the drives in my Norco RPC-4224

temperatures.py

#!/bin/env python3
#______________________________________________________________________________
from multiprocessing import Pool
import subprocess
from collections import defaultdict
from os import path

#______________________________________________________________________________
# (device_exists, smart_status, smart_output)
def get_smart(device):
    if not path.exists(device):
        return (False, None, None)
    try:
        output = subprocess.check_output([
            '/usr/sbin/smartctl',
            '-a',
            device,
        ], universal_newlines=True)
        return (True, 0, output)
    # Thrown if we have a bad smart log
    except subprocess.CalledProcessError as e:
        return (True, e.returncode, e.output)

def get_temperature(device):
    smart = get_smart(device)
    if not smart[0]:
        return (False, None, None)
    smart_warning = smart[1] != 0

    lines = smart[2].split('\n')
    for line in lines:
        # For normal SATA drives
        if 'Temperature_Celsius' in line:
            tokens = line.split()
            temperature = int(tokens[9])
            return (True, smart_warning, temperature)
        # For SAS drives
        if 'Current Drive Temperature:' in line:
            tokens = line.split()
            temperature = int(tokens[3])
            return (True, smart_warning, temperature)
    return (True, smart_warning, None)

def format_temperature(status):
    if not status[0]:
        return '-'
    if status[1]:
        return 'warn %dC' % status[2]
    else:
        return '%dC' % status[2]

#______________________________________________________________________________
# Prepare output table
ROWS = 7
COLUMNS = 5
cell = defaultdict(str)
# Table headers
for column in range(1, COLUMNS):
    cell[0, column] = 'across-%d' % column
for row in range(1, ROWS):
    cell[row, 0] = 'down-%d' % row
# Populate table
temperatures = dict()
with Pool() as pool:
    for down in range(1,ROWS):
        for across in range(1,COLUMNS):
            temperatures[down, across] = pool.apply_async(
                get_temperature, ('/dev/disk/by-vdev/down-%d-across-%d' % (down, across),)
            )
    for key, value in temperatures.items():
        temperatures[key] = value.get()
        cell[key] = format_temperature(temperatures[key])

# Display table
for row in range(ROWS):
    for column in range(COLUMNS):
        print('{:>8} '.format(cell[row, column]), end='')
    print('')