Running into the same issue where fans continuously cycling up and down. I have not installed Freenas yet on my build. I am running IPMIUtil on a remote machine running Win7. I changed the lower and upper threshold values to 100/3000 for all 3 case fans only. I left the CPU fan alone. The specs for the fans used in my case are listed here
https://www.sanyodenki.com/archive/document/corporatedata/technicalreport/2004/TR17e_c_en.pdf
They make no mention of minimum ratings so I can base my thresholds. After I made changes to the thresholds I made sure to reboot and still no changes
C:\.........\IPMI>ipmiutil sensor -N 192.168.0.180 -U "
Username"-P "
Password"
-c
ipmiutil ver 2.98
isensor: version 2.98
Connecting to node 192.168.0.180
-- BMC version 1.11, IPMI version 2.0
ID | SDRType | Type |SNum| Name |Status| Reading
0004 | Full | Temperature | 01 | CPU Temp | OK | 39.00 C
0047 | Full | Temperature | 0a | PCH Temp | OK | 27.00 C
008a | Full | Temperature | 0b | System Temp | OK | 24.00 C
00cd | Full | Temperature | 0c | Peripheral Temp | OK | 31.00 C
0110 | Full | Temperature | 10 | VcpuVRM Temp | OK | 35.00 C
0153 | Full | Temperature | b0 | DIMMA1 Temp | Absent | 0.00 na
0196 | Full | Temperature | b1 | DIMMA2 Temp | Absent | 0.00 na
01d9 | Full | Temperature | b4 | DIMMB1 Temp | Absent | 0.00 na
021c | Full | Temperature | b5 | DIMMB2 Temp | Absent | 0.00 na
025f | Full | Fan | 41 | FAN1 | OK | 2500.00 RPM<-------------CPU FAN
02a2 | Full | Fan | 42 | FAN2 | AboveCrit | 6000.00 R<-------------CaseFAN
PM
02e5 | Full | Fan | 43 | FAN3 | AboveCrit | 6100.00 R<-------------CaseFAN
PM
0328 | Full | Fan | 44 | FAN4 | Absent | 0.00 na
036b | Full | Fan | 45 | FANA | AboveCrit | 6200.00 R<-------------CaseFAN
PM
03ae | Full | Voltage | 30 | 12V | OK | 12.13 V
03f1 | Full | Voltage | 31 | 5VCC | OK | 4.97 V
0434 | Full | Voltage | 32 | 3.3VCC | OK | 3.37 V
0477 | Full | Voltage | 33 | VBAT | OK | 2.97 V
04ba | Full | Voltage | 34 | VCPU | OK | 1.15 V
04fd | Full | Voltage | 35 | VDIMMAB | OK | 1.21 V
0540 | Full | Voltage | 38 | 5VSB | OK | 5.05 V
0583 | Full | Voltage | 39 | 3.3VSB | OK | 3.33 V
05c6 | Full | Voltage | 3b | VBMC 1.2V | OK | 1.20 V
0609 | Full | Voltage | 3c | VPCH 1.0V | OK | 0.99 V
064c | Full | Platform Securi | aa | Chassis Intru | OK | 0.00 na
ipmiutil sensor, completed successfully