Monitoring Hard Disks with SMART

I have quite a few hard disks running at all times. I came across this article this weekend and whipped up a little something to keep an eye on them.

import subprocess
import os
disk_uuids = [entry.split()[0].split('=')[1] for entry in open('/etc/fstab')
              if entry.startswith('UUID=')]
disk_devices = []
for uuid in disk_uuids:
  uuid_path = '/dev/disk/by-uuid/' + uuid
  try:
    dev = os.readlink(uuid_path)
    dev = os.path.join(os.path.dirname(uuid_path), dev)
    dev = os.path.abspath(dev)
  except OSError:
    print '%s does not exist.' % uuid_path
    continue
  disk_devices.append(dev)
disk_health = {}
for disk in disk_devices:
  p = subprocess.Popen(['smartctl', '-Hc', disk], stdout=subprocess.PIPE)
  for line in p.stdout.readlines():
    if line.startswith('SMART overall-health self-assessment test result:'):
      health = line.split()[-1]
      disk_health[disk] = health
      break
for disk, health in disk_health.iteritems():
  print '%-12.12s%s' % (disk, health)