June 30, 201610 yr My server is fairly full of spare drives that were not necessarily selected for how cool they run. There is also the distinct possibility that I do not have my server configured (wires/fans/etc) optimally for air flow, though I have done the best I can I think? I live in a house w/o AC so things can get a bit warm in the summer time and my server seems to suffer the most. I get warnings at least twice a week that one or more (usually disk1 [because its written to first?]) has reached 40C which is well above the Backblaze sweet spot (I know there is some debate over the acceptable range but I am going with them for now). The only thing I can think of left to do is for the server to go to sleep, or shutdown, or at least spin down and stay spun down until it reaches some "sweet spot temperature" (I have tried manually spinning the disks down but I guess something on the network tries accessing the server and it spins back up?). The only post I was able to find was this one, I would think there are others (feel free to point me to them) but wasn't able to find them. I would love to be able to figure something out. A side benefit I guess would be quieting the server down as its a bit of a beast (to me at least) and quieting down the fans and drives occasionally would be a nice bonus. Any thoughts, useful suggestions would really be appreciated!
June 30, 201610 yr The problem is trying to stop the array when files are open. If no files are open, then the drives should spin down and go to low power and cool off, without having to stop the array. If drives are being kept spinning that means software is accessing the drives, and that will prevent normal unRAID shutdown.
June 30, 201610 yr As far as airflow, try to make sure all the air has to pass over the drives. That means taping up any holes not either supplying air directly to the drives, or directly feeding a fan. Can you post a picture or diagram of your setup? Most of the time all fans should be set to exhaust unless they are directly in front of the drives. I've seen a bunch of setups where people have multiple intake and exhaust fans, which just pushes the air around without actually cooling the drives. If you don't have hot swap drive cages, you may need to tape some cardboard in strategic locations to force the airflow over the drives.
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