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Visual verification of storage LED state

To really make sure that what the hardware is telling us and what a human actually sees, we added a USB attached camera and code to interpret video captures.

So that we can take this:

example

and end up with:

results:
- state: 4
  wwn: 50014ee26049cc9d
- state: 2
  wwn: 50014ee20aeb1530
- state: 4
  wwn: 50014ee20ae9bafa
- state: 2
  wwn: 50014ee2b59fb711
statekey: '{OFF: 1, NORM: 2, LOCATE: 3, FAULT: 4, LOCATE_FAULT: 5, UNKNOWN: 6}'

It's a bit more complicated, as some of the LED states are blinking, so we need to take a number of samples to determine what is going on. See source code for all the details.

Caveats: This code is very specific to one of our test systems and would need changes for others to utilize.

What to do when the camera gets moved

  1. Collect an updated image, figure out what LEDs you have access too and update the REG_0 - REG_N variables for regions of interest
  2. Test it
  3. Update the config.yaml to ensure that each LED has the correct WWN