Does anyone happen to know how Supermicro chassis determine temperature (and in turn fan speed)?
I got a SC836A-R1200B. I like everything, except the fans are crazy loud. But I know they are temperature controlled. When I first built the system and turned it on, after boot, the fans settled down, and it was an acceptable noise level.
Then I turned the system off, shuffled some stuff around in my rack, and turned the system back on. Now the fans are running full-speed, and the temperature light on the case is flashing.
For some reason, the system thinks something is too hot, so it won't let the fans spin slowly. But I can't figure out what that is.
I monitor temperatures pretty closely with Munin, and no temps have gone up... only fan RPM. (I can even see on the Munin graphs a short time where I first powered on the system and the fans ran slowly.)
Any thoughts?
I got a SC836A-R1200B. I like everything, except the fans are crazy loud. But I know they are temperature controlled. When I first built the system and turned it on, after boot, the fans settled down, and it was an acceptable noise level.
Then I turned the system off, shuffled some stuff around in my rack, and turned the system back on. Now the fans are running full-speed, and the temperature light on the case is flashing.
For some reason, the system thinks something is too hot, so it won't let the fans spin slowly. But I can't figure out what that is.
I monitor temperatures pretty closely with Munin, and no temps have gone up... only fan RPM. (I can even see on the Munin graphs a short time where I first powered on the system and the fans ran slowly.)
Any thoughts?