[smartmontools-support] Airflow_Temperature_Cel as reported by smartd and smartctl

[Cosmin Luță]

Hi,

I noticed a discrepancy between the value of Airflow_Temperature_Cel
as reported in the logs of smartd and the value from smartctl:

Apr 06 16:41:18 storage smartd[3589676]: Device: /dev/sda [SAT], SMART
Usage Attribute: 190 Airflow_Temperature_Cel changed from 69 to 68

However, smartctl reports it "correctly" (as 100 - value reported by smartd):

$ smartctl -A /dev/sda | grep -i temper
190 Airflow_Temperature_Cel 0x0022   068   063   040    Old_age
Always       -       32 (Min/Max 29/37)
194 Temperature_Celsius     0x0022   032   040   000    Old_age
Always       -       32 (0 23 0 0 0)

Have I misconfigured something or is this some sort of bug? I'm using
smartmontools 7.1-1 (arch linux) and the drive is a Seagate Ironwolf
4TB.

In smartd.conf I have:

DEFAULT -a -n standby -m email at address.com -W 5,40,45 -e apm,off -e standby,off
DEVICESCAN