Hey guys, new member here. Apologies in advance for this rather lengthy first post!
I'm considering a single 6 PRO (too bad they don't make a 6 LT as I'll probably be removing the display portion) to control the fans in my primary and backup media servers.
The primary server consists of a single SuperMicro 846 4U 24 disk chassis loaded with 12 6TB drives and 12 4 TB drives.
The backup server consists of 3 of the same 846 chassis' loaded with 60 2TB drives. The first chassis contains the motherboard and chassis' 2 and 3 only contains disks (and a power controller).
Each chassis contain 3 midplane fans that control the front to back airflow. Here are a couple of shots of the primary server to give you an idea of the layout:
The fans are all 4 pin PWM units, namely these 80mm ones:
And here's a shot of one of the chassis with just drives in them and a power controller:
The problem I have is that the neither the Supermicro motherboards (X10-SLR-F) not the power controller boards, allows fine tuning of fan speed and it is not related to chassis temp at all. I pretty much only have a choice of 4 fixed speeds as seen in the IPMI screenshot below:
So at the moment, all 12 fans are running at a very high speed, consumes a lot of power, and make a lot of noise. The hard drives all idle down when not in use, but the fans keep screaming along. So, I was thinking that a single 6 Pro, with its 4 PWM channels, could control the fan speed in all 4 chassis. I would of course need to mount a temp probe in each chassis, which would then control the speed of the fans to whatever set point I choose. My goal is to keep the hard drives in each chassis from going above 40C, so whatever probe temp that translates to, is what I need configure the probe in each chassis for. I'm sure the set points will be different in each chassis as the the drives have different heat signatures and how much heat they generate is very dependent on the load on the server, and during scrubs, they will generate the most heat, and next to nothing when idled down.
In a prefect world, I would poll the drives via SMART to determine which hard disk was hottest, and then adjust the fan speed accordingly, but as far as I know the Aquaero software doesn't support that. I wrote a little script that goes out and polls the drives. Here's what it spits out for the main chassis:
If I can somehow feed those drive temps into the controller software, awesome, but if not, playing around with the probe temp settings and fan curves will get me there I think.
I figured I'd pick up 4 of the SilverStone CPF04 PWM 8 way Fan Hubs (wish they made a 4 way) and install one in each chassis. Since the fans are rather beefy at 1.1A a pop, that would be safer I would think, than trying to run 3.3A worth of fans directly of each channel on the 6 PRO.
The 4 chassis are all install in a rack in the basement, flush with a wall. Here's what it looks like:
And I have plenty of access around back and have the ability to pull out each chassis for service as needed:
Closer look at the back side of the 846 stack:
I'm thinking I would mount the 6 PRO inside one of the disk only chassis (this is why I wish they made a 6 LT), and then run 4 pin cables for the fans and 2 pin cables for the probes, to the other 3 chassis.
So does this sound like a job the 6 PRO would be capable of? I have close to $20k invested in this stack of 4 chassis, and they live and die by the fans operating as they should, so I need to make sure that this solution will be reliable.Edited by pclausen - 8/6/16 at 5:21am