Why Supermicro MB with AIC RSC-2EH chassis FANs too noisy?


A: the fan speeds with the IPMI code you guys have installed on the MotherBoard. With other Vendor's chassis, same SuperMicro MotherBoard, we would issue "ipmitool" commands to control the fan(s) speed but on this chassis it does not work and the fans are TOO noisy. The
temperature of the chassis is really low so we can afford to slow down the fans speed to help lower the noise level but we can not do this with the chassis/MB combination. Here is what we use on other chassis's and expected it to work on AIC's: Documentation from SuperMicro states there are 3 levels of fans, i.e.
Full - 100% of PWM Cycle
Standard - 50% of PWM Cycle (+ "temp controlled")
Optimal - 30% of PWM Cycle (+ "temp controlled")
One uses the following commands to set the speeds:
Set fans to standard speed would be
#ipmitool raw 0x30 0x45 1 0
Full speed:
#ipmitool raw 0x30 0x45 1 1
Optimal speed:
#ipmitool raw 0x30 0x45 1 2
We have tried setting the fans to "0" and "2" but the fans
do not slow down......and the temperature in the
chassis stays at 56 degrees Celsius, which we can afford to
increase by lowering the fan(s) speed, i.e. 70-80 Celsius
is fine....Customers will be complaining unless we can lower
the fan noise.......

The issue is related to the fan configuration. Can you try to update the fan profile? Using the IPMICFG:

1. Ipmicfg -nm updatemode

2. Ipmicfg fan Step 1 forces the update of the fans profile (where the fans are plugged in); step 2 to check the fan speed profile.

6/6 Below are our testing results:

1. ipmitool raw 0x30 0x45 1 0

Ipmitool sdr 3x fans are around 5200 rpms

2. ipmitool raw 0x30 0x45 1 1

Ipmitool sdr 3x fans are around 7200 rpms

3. ipmitool raw 0x30 0x45 1 1

Ipmitool sdr 3x fans are around 5200 rpm, CPU temp on 45 degrees

Last update:
2015-06-19 21:39
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