TrueNAS SCALE Web UI shows 70°C on Intel SSD Pro 1500 (SSDSC2BF180A4L), SMART reports 33°C — false temperature reading?

AndreyG · Вчера в 11:38

Subject: TrueNAS SCALE Web UI shows 70°C on Intel SSD (SSDSC2BF180A4L), SMART reports 33°C — false temperature reading?

Description:

Hi,

I'm using an Intel SSDSC2BF180A4L (Pro 1500 Series, 2.5" SATA, MLC NAND) as a dedicated SLOG device in a ZFS pool.

The system is running TrueNAS SCALE 24.10.2.1.

The Web UI consistently shows a temperature of 70°C for this SSD, which triggers overheating warnings and alerts.

However, when I check the SMART data from the CLI:

Код:

smartctl -A /dev/sdk | grep -i temp
smartctl -Aj /dev/sdk

…the actual reported temperature is 33°C, and the SMART log confirms the maximum temperature ever reached is 46°C.

Physically touching the SSD confirms that it's cool to the touch — roughly 30°C. The reported 70°C in the Web UI is completely unrealistic.

SMART JSON snippet:

Код:

"temperature": {
  "current": 33
},
"Airflow_Temperature_Cel": {
  "id": 190,
  "value": 33,
  "raw": {
    "value": 47247654945,
    "string": "33 (Min/Max 11/46)"
  }
}

It seems the Web UI is incorrectly interpreting SMART attribute 190, possibly using the raw value or an incorrect byte offset, resulting in a completely false temperature reading.

Why this matters:

This disk is assigned as a ZFS SLOG device, so it's under consistent synchronous write load.
False temperature readings lead to confusing alerts and potentially unnecessary drive replacements.
Real overheating could be ignored due to frequent false warnings.

The disk is healthy:

SMART shows 33°C current, 46°C max
233 Media_Wearout_Indicator = 94
No reallocated sectors, no real errors
Installed in a cool chassis with proper airflow
Physically cold — checked by hand

Question: Has anyone else experienced this issue?
Is there a known fix or workaround to make TrueNAS SCALE use the correct SMART temperature?

Thanks!

TrueNAS SCALE Web UI shows 70°C on Intel SSD Pro 1500 (SSDSC2BF180A4L), SMART reports 33°C — false temperature reading?

AndreyG

Активист