Tool to Control Fan - fanctl

[Neo2018]

@Neo2018  One way to accomplish this is:

Code:

smartctl --all /dev/sda|grep -i temp

Not sure if there is a "smarter" way to extract just the single value.

I don't know if that's what you're looking for or what is meant, but that's what I found out:
at hddtemp the standard output is:

Code:

/dev/sda: ST1********08-***03: drive is sleeping

The temperature is only displayed when the hard disk/hdd is in use:

Code:

/dev/sda: ST1********08-***03: 40°C

Therefore you can ignore the output of hddtemp!
There is still hdparm, but here too the output is confusing.

1. output: /dev/sda: drive state is: active/idle > means that the HDD is in active work!
   
2. output: /dev/sda: drive state is: unknown  > means that the HDD is working or waiting, idling!
   
3. output: /dev/sda: drive state is: standby    > means that the HDD is asleep or in standby!
   

The good thing is that if the HDD is in standby/sleeps, they are not activated, because, for example, when you query with smartctl --all /dev/sda | grep -i temp, the HDD is brought out of standby/sleepy.

Code:

$ 'date' && sudo hddtemp /dev/sda && sudo  hddtemp /dev/sdc && sudo hddtemp /dev/sdb && sudo hdparm -C /dev/sda && sudo hdparm -C /dev/sdc && sudo hdparm -C /dev/sdb

Mo 15. Mär 10:14:17 CET 2021
/dev/sda: ST10000VN0008-2PJ103: drive is sleeping
/dev/sdc: ST8000VN0022-2EL112: drive is sleeping
/dev/sdb: WDC WD5000LUCT-63RC2Y0: 39°C

/dev/sda:
drive state is:  unknown

/dev/sdc:
drive state is:  standby

/dev/sdb:
drive state is:  active/idle

Code:

$ sudo smartctl --all /dev/sda|grep -i temp
190 Airflow_Temperature_Cel 0x0022   061   049   040    Old_age   Always       -       39 (Min/Max 30/45)
194 Temperature_Celsius     0x0022   039   045   000    Old_age   Always       -       39 (0 22 0 0 0)

maybe help to understand that