FreeNAS 9.10 includes sg_ses as part of the standard image.
Usage
This fork looks up the ThinkServer Enclosure automatically. Works when the devices are either /dev/sg* or /dev/ses*
Use fancontrol.py to set the fan speed:
# python fancontrol.py 2
Enclosure not found on /dev/sg8
Enclosure not found on /dev/sg7
Enclosure found on /dev/sg6
Fan 0 speed: 0
Fan 1 speed: 947
Fan 2 speed: 932
Fan 3 speed: 812
Fan 4 speed: 932
Fan 5 speed: 947
Reading current configuration...
Setting fan 0 to 2
Setting fan 1 to 2
Setting fan 2 to 2
Setting fan 3 to 2
Setting fan 4 to 2
Setting fan 5 to 2
LENOVO ThinkServerSA120 1007
Sending Enclosure Control [0x2] page, with page length=296 bytes
Fan 0 speed: 0
Fan 1 speed: 945
Fan 2 speed: 932
Fan 3 speed: 812
Fan 4 speed: 926
Fan 5 speed: 945