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SP/BMC sensor showing minus temperature(-57 C) on CPU, is this normal?

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Answer

Yes.
 
Negative temperature values (minus degrees) in the SP/BMC logs are normal values for sensors. Example :

::> system node environment sensors show -node * -type thermal
Node     Sensor                State      Value/Units Crit-Low    Warn-Low   Warn-Hi   Crit-Hi
----     --------------------- ------      ----------- --------   --------  ---------  -----
node-01  CPU1 DTS Temp         normal      -58 C          -        -         -10       0
         CPU2 DTS Temp         normal      -57 C          -        -         -10       0

In ONTAP systems, the CPU temperature sensors report how many degrees Celsius the CPU is below its critical shutdown temperature. That’s why the values are negative —.

  • These values mean the CPU is currently operating 57 to 58 degrees below the temperature at which it would automatically shut down to prevent damage.
  • So, in this case, the system is running well within safe thermal limits, and the 'normal' state confirms that there's no issue.
  • Alerts will trigger if the thermal value approaches 0°C

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