[FEAT] Add some magic to report correct power on hours for Samsung 970 series of SSDs

[pmhausen]

Is your feature request related to a problem? Please describe.

The power on hours of my - otherwise great and perfectly reliable - Samsung 970 EVO Plus are odd. Search engine turned up this discussion on Ask Ubuntu:

https://askubuntu.com/questions/1147619/nvme-samsung-ssd-970-evo-500gb-wrong-smart-power-on-hours

Describe the solution you'd like

The values for my servers are definitely increasing so I don't think these Samsung drives reset the counter to zero at each power cycle like some Transcend SSDs do. The factor of 8 looks consistent with my devices.

Do you have sources to verify if that is indeed correct? Seems to apply to 980 series, too. Although the Reddit discussions I found are much more vague than the cited one on Ask Ubuntu.

If you are fine with the reasoning, please multiply the values at least for Samsung 970 EVO and 970 EVO Plus by a factor of 8.

Kind regards,
Patrick

[pmhausen]

OK, some more research and it seems it is not quite as simple as I thought.

I have two 970 EVO Plus 1 TB that correctly show 4 years of power on time and definitely have not been in service for three decades (x8) ;-)
I have a 970 EVO Plus 500 GB that I received on Oct. 23rd and that shows 10 hours of operation while the reality is more like 80.

All drives have the same firmware version 2B2QEXM7.

Any feckin' idea?

[pmhausen]

Any comment by anyone? Nobody else observes this behaviour? Samsung 970 are quite popular, aren't they?

[Agent6-6-6]

@pmhausen - I have always seen the same thing on both a 1Tb and 2Tb Evo 970.

Hadn't bothered me too much but if it's something that could be fixed I would be good.

[Agent6-6-6]

Seems for whatever reason it is out by a factor of 8 for these drives:-
https://askubuntu.com/questions/1147619/nvme-samsung-ssd-970-evo-500gb-wrong-smart-power-on-hours

Wonder if knowing this if some work around can be specified. Like for a specific drive where you know this occurs manually have a way of defining the scaling factor for purposes of reporting in the gui the corrected power on hours/time. Define on a drive by drive basis when you define what drives to monitor for example.

Still store raw values in database. But have option to view the corrected values on the summary or detailed drive info screens based on a drive specific scaling factor for power on hours only.