S9 - stop hashing while keeping bmminer on

[tim-bc]

Right now I have a script in place that checks on some antminer s9's API temperatures, and if they are too hot the pool is changed to localhost. This way the fans still blow but the boards will not hash. Unfortunately, this kills bmminer and thus the api is not available to see the temperatures anymore.

I tried the disablepool command but it seems that the miner will still hash even though it doesn't submit the shares to the pool anymore. Is there any way to stop the boards from hashing while keeping the fans and bmminer up so I can read the temps?

P.S. I'm aware of the insane power draw on idle but please disregard it in this case.

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[fanatic26]

I dont see a way to do what you want. If you are overheating your miners wouldnt the energy be better spent on fixing your cooling issues rather than making a hackjob that wastes money?

[tim-bc]

Unfortunately I only have only some duties, and working on cooling is not one of them. There are larger fans coming but until then I was hoping for some temporary solution besides powering everything down.

Do you know if there is any way to lower the internal thermal cutoff?

[fanatic26]

Someone that digs into the code some more might have an idea but I have not seen a way to do that. Whats wrong with just letting them shut off at their normal thermal limit? Thats what its designed to do already.

[Steamtyme]

Hey Tim; glad to see your still up and running.

As you may remember I'm more of a real world guy not so much coding or programming. Have you thought about just measuring the average time it takes to currently reduce the temperatures?

What I mean is the next time you monitor the higher temps and your script changes over to allow the fans to cool the board; you time the cool down process.

Doing this will give you a baseline that in all likelihood is around 10 minutes maybe less. Using this information you could set a timer for switching back to your main pool, in your script... if that's possible again not my strong suit.

Depending on how many banks you have you may want to assign a different time to each one if there is a noticeable difference in cool down time.

Not sure if that's helpful, good luck.

[tim-bc]

I would also prefer to let them hit the thermal limit as designed. It just seems that the thermal limit is too high, and after numerous fires there is more pressure to have a software solution to prevent the miners from getting that hot. Similar to what Steamtyme suggested the script has been modified now to just change the pool to localhost and wait an hour (unnecessarily long? imo) before it switches back. I guess we will see how things go.

[Steamtyme]

I would say that is longer than needed, next time you get a chance set a few of them to say 20 minutes downtime then switch back to a pool and see what your temps look like. I doubled my time after seeing some of your other photos, lol.

I was just reading up on your fan wire melting, sorry to cross post, but you mentioned ambient air temps of 40C on your cold side is that consistent with the outside air temperature?? You may be experiencing short circuiting on a larger scale from your exhaust fans back around to your air intakes. It might be something yo investigate. I always assumed your region had an average of 25-33C summer temps with the odd day getting up around 40C

I only mention that because it could help with your overall heat management issue.

[tim-bc]

you mentioned ambient air temps of 40C on your cold side is that consistent with the outside air temperature?? You may be experiencing short circuiting on a larger scale from your exhaust fans back around to your air intakes

It should be, but it is not. It seems that currently the exhaust fans cannot handle the miners when they get hot and put fans to 100%. In the non-summer periods it was easier since the miner fans were not at 100% and all the hot air could be exhausted, but in the summer now the miners are creating more airflow and what cannot be exhausted is leaking out around the miners and being sucked back through. It's honestly quite a bad situation and I hope the bigger exhaust fans arrive soon..