TalkChess.com

[Vincent Diepeveen]

hi,

My chessprogram runs on a box that uses a switch that doesn't have a 'power off' button.

This mellanox switch however, you can see from my facebook pictures there (my entire facebook is open to the entire world to browse), it produces 75 decibel or so and i sit a few meters away from it.

Now i got rid of the fans from the switch and replaced it by cardboard and big outside fans. Where the psu can give power to 1 fan that cools the psu (hopefully it'll go ok as the airpressure of the fans i use isn't that high), the other 3 fans from the case do not have this luxury solution. The easiest solution is use an external adapter.

This external adapter could break at which point a disaster might happen to the switch. From 1 of the motherboards of the box i can easily monitor the RPM of the external fans. If one of them drops to near zero, which would happen for example if the adapter breaks, then i want to give the controlling proces there the order to cut the power of the switch.

Writing the software i'll manage, but what device to use that i can control by software or maybe even a simpler solution is there.

Note that i do realize this is not a 100% solution, yet the odds that one day the 12 volt adapter breaks is there, so i want to catch THAT possibility.

I feel some cheapskate solution probably exists. Any thoughts on how to solve this i welcome.