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Fan Speed monitoring

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brd

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Recently I moved a server into a proper cabinet with doors. After a few days I noticed the fans were spinning up and down. So I started investigating ways to monitor the fan speed. I figured having a graph of them long term would give me a nice way to show changes in the environment, beyond the temperature monitoring I am already doing.

I was not having much luck searching the Internet. Luckily, Darius on IRC pointed me to a project called bsdhwmon by Jeremy Chadwick, a fellow FreeBSD Developer. The server is running an older Supermicro X7SBi motherboard with a Winbond 83627HG chip which is listed on the supported page of bsdhwmon.

It was easy to setup:

  • Install bsdhwmon: pkg install bsdhwmon
  • Load the SMBus Controller driver for my motherboard: kldload ichsmb
  • Load the Generic SMB I/O Device driver: kldload smb

All I had to do from that point was run bsdhwmon:
# bsdhwmon
CPU1 Temperature 46 C
System Temperature 29 C
FAN1 10975 RPM
FAN2 11344 RPM
FAN3 7219 RPM
FAN4 7068 RPM
FAN5 0 RPM
FAN6 11065 RPM
VcoreA 1.122 V
MCH Core 1.508 V
-12V -12.672 V
V_DIMM 1.808 V
+3.3V 3.296 V
+12V 11.904 V
5Vsb 5.046 V
5VDD 4.998 V
P_VTT 1.228 V
Vbat 3.312 V

It is important to remember to add the kernel modules to be loaded at boot. Adding the following to /boot/loader.conf will take care of that:
smb_load="YES"
ichsmb_load="YES"
Note that ichsmb will load smbus, but not the smb kernel driver.

Now that I have the tools, I can monitor it at will.



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