Thanks, I'll keep that in mind when I start doing scrubs. While these 846 chassis are in my basement, they are right behind the wall with my projection screen, so the noise was quite annoying in the past when we were down there watching movies on the big screen.
So I really love the ability to control the fan speed on the main chassis now as well as being able to monitor the power consumption and track it over time.
I'd love to be able to do that with the 2 "drive only" chassis' as well. So I have this old revision power controller board that used to be in the chassis that now has the X10 motherboard:
When I was using it, the 2 rear 3 pin fan connectors were connected to the 2 rear fans, and the 3 mid plane fans were connected to the 4 pin fan connectors on the SAS2 expander backplane. With this setup, it was not possible to adjust any fan speeds, all 5 fans were running at full blast all the time.
Supermicro has a newer power controller board which looks like this:
Is has a pair of 4 pin fan connectors installed. Looking at the PCB, it looks like it would be possible to install 6 additional 4 pin fan connectors! Unfortunately, I suspect that it would take more than just soldering them in to make them work.
Other than the 4 pin fan connectors, a very interesting feature on this power board is the inclusion of a 5 pin Power System Management Bus (I2C) connector. My X10 mobo has this as well and it is what allows me to monitor the power consumption via the IPMI web interface.
There is also a separate 4pin I2C connector. Now I know the normal intent is to connect this to the expander backplane, but I'm not sure what that would do for me since I can't access it anyway. The X10 motherboard has a pair of I2C jumpers (I2C1 and I2C2) that can be set to enable I2C System Management Bus for the PCI-E slots. So I wonder if that means I can get a PCI Express card that has I2C connectors I can then connect to the power controller cards in the external chassis?
My goal is to be able to monitor power consumption in all 3 chassis as well as being able to control fan speed in both external chassis, and I'd like to be able to do it via the IPMI interface.
If that is all a pipe dream, then I guess I'll need some sort of manual fan controller for the fans in the external 846 chassis. Right now I know one of them has 3 pin fans. Not sure yet what the 2nd one has yet. I guess the cheapest solution for the 3pin fan chassis would be to just add a resistor inline with each fan to reduce the speed. I believe they are around 1A @ 12 volt. So that is about 12 ohms and 12 watts. So to drop the speed in half, I would need a 6 watt 12 ohm resistor, right?
A better solution would probably be to get one of these for each 3pin fan:
http://www.ebay.com/itm/PC-Fan-CPU-...682?pt=LH_DefaultDomain_0&hash=item4acc715682
Or these if I upgrade to 4pin fans:
http://www.ebay.com/itm/Mini-Fan-Co...631?pt=LH_DefaultDomain_0&hash=item3a8346e517
Any experience with any of these solutions would be greatly appreciated! Again, my preference would be to be able to monitor control all the chassis from the IPMI interface, but I realize that might not be possible.