Hardware that supports monitoring will display different information about hardware status, like temperature, voltage, current, fan-speed, etc.
Example on CCR1072-1G-8S+ device:
cpu-overtemp-check: yes cpu-overtemp-threshold: 100C cpu-overtemp-startup-delay: 1m cpu-temperature: 46C power-consumption: 62.9W board-temperature1: 31C board-temperature2: 34C psu1-voltage: 12.1V psu2-voltage: 0V psu1-current: 5.2A psu2-current: 0A fan1-speed: 6375RPM fan2-speed: 6436RPM fan3-speed: 6375RPM fan4-speed: 6467RPM
Routers that support voltage monitoring will display supplied voltage value. In CLI/Winbox it will display volts. In scripts/API/SNMP this will be dV or value showed in CLI/Winbox multiplied by 10
Routers that support temperature monitoring will display temperature reading. In CLI/Winbox it will display degrees Celsius. Using scripts/API/SNMP this value will be shown in CLI/Winbox multiplied by 10. There are various temperature sensors depending on the device. These sensors may refer to: cpu-temperature, pcb-temperature, sfp-temperature.
Fan control and behaviour
/system health set
Using this menu users will be able to control fan behaviour on TILE architecture devices. Currently, for other RouterBOARD devices, there is no option to manually control FAN behaviour.
There are three parameters that may affect fan behaviour: PoE-out consumption, SFP temperature and CPU temperature. As soon as one of the parameters exceeds the optimal value - fans are started.
If device has PoE-out, then fan RPM will change as described below:
|PoE-out load||RPM % of max FAN speed (DC fans)|
|0%..24%||FAN speed 0%|
|25%..46%||FAN speed 25%|
|47%..70%||FAN speed 50%|
|71%..92%||FAN speed 75%|
|93%..||FAN speed 100%|
For devices with PWM fans speed will rise/drop smoother and will change linearly from 9..88% (below 100W min RPM=0)
CPU and SFP temperature
If CPU/SFP temperature raises higher than 58C, fans will start spin. The higher is temperature, the faster fans will spin. For devices with PWM fans spinning will be smoother, if temperature will rise higher then 58C on CPU/SFP, fans will try to keep temperature at 58C if possible. The same condition goes for DC fans, but here min. fan RPM is higher by default, which may result as CPU/SFP are cooled till temperature when fans turn-off completely. As a result, temperature can slowly go back to 58C and fans will turn-on again.
Currently exception is S+RJ10 modules. Fans will start to spin if these modules will reach 65C. The higher higher temperature, the faster fans will spin.