Health

Summary

Hardware that supports monitoring will display different information about hardware status, like temperature, voltage, current, fan-speed, etc.

Example on CCR1072-1G-8S+ device:

[admin@MikroTik] > system/health/print 
Columns: NAME, VALUE, TYPE
 #  NAME                VALUE  TYPE
 0  power-consumption   50.8   W   
 1  cpu-temperature     43     C   
 2  fan1-speed          5654   RPM 
 3  fan2-speed          5825   RPM 
 4  fan3-speed          5800   RPM 
 5  fan4-speed          5750   RPM 
 6  board-temperature1  29     C   
 7  board-temperature2  28     C   
 8  psu1-voltage        0      V   
 9  psu2-voltage        12.1   V   
10  psu1-current        0      A   
11  psu2-current        4.2    A

Warning: For feature availability on RouterBOARD products check mikrotik.com

Intensive health monitoring on the CCR2004-16G-2S+PC device (from the console, winbox or SNMP) causes significant CPU load.

Voltage

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 

Note: Routers that have PEXT and PoE power input are calibrated using PEXT, as a result, value showed over PoE can be lower than input voltage due to additional ethernet protection chains.

[admin@MikroTik] > system/health/print 
Columns: NAME, VALUE, TYPE
#  NAME         VALUE  TYPE
0  voltage      23.8   V   
1  temperature  39     C 

Temperature

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. Device tested ambient temperature range you can find in specification description at mikrotik.com. Tested ambient temperature range is temperature in which device can be physically located. It is not the same as temperature which reports system health monitor!

Fan control and behavior

/system health set

Using this menu users will be able to control fan behaviour on TILE architecture devices.

Note: Improved FAN stability starting from version 6.45.5.

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 the, fans are started.

PoE-out consumption

If a device has PoE-out, then the fan RPM will change as described below:

For devices with PWM fans, the speed will linearly increase or decrease from 9..88% (note: below 100W the fan RPM=0)

Limited manual fan-control option

Note: Starting from RouterOS version 7.9beta4 limited manual fan-control options have been added for CRS3xx, CRS5xx and CCR2xxx devices.

Fan behavior can be manipulated using the settings section of system health:

/system health settings set 

Available properties are described below:

CPU and SFP temperature

If CPU or SFP temperatures exceed 58C, the fans will start to spin. The higher the temperature, the faster the fans will spin. For devices with PWM fans, as the CPU or SFP temperatures exceed 58C, the fans will linearly increase their RPM to try to keep the temperature at 58C if possible. For devices with DC fans, as the CPU or SFP temperatures exceed 58C, the fans will start spinning but at a higher minimum RPM by default. This may result in cooling the device to the point where the fans turn-off completely. After which the temperature may slowly increase to 58C and the fans will turn on again. Currently, there is one exception. The S+RJ10 modules have a temperature threshold of 65C before they trigger the fans. Since it's a higher temperature threshold, the fans will start spinning at a higher initial speed to cool the device.

Note: All readings are approximate and may not be 100% precise. Their purpose is to ~inform users about possible/upcoming failures.