My ‘Power On Hours’ has been replaced by ‘Power On Hours Ago’ when I view SMART test results.
How do I get ‘Power On Hours’ instead?
You are going to need to be much more specific that that. What is reporting “Power On Hours Ago”? Post the entire output of smartctl -x /dev/sda (sda being the drive in question).
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I’m sure it used to default to Power On Hours. This Power On Hours Ago isn’t helpful to me and I can’t see a way to switch it back?
I am seeing the same on Fangtooth 25.04.1. It may have been different in a previous Fangtooth or other Scale verison
Screenshot with the columns options
EDIT: not sure if this would be considered a Feedback issue or a Bug issue. Tooltip showing both but it isn’t a Column choice for display. Either way, it probably should get submitted to iX Systems
I looked at a Goldeneye VM in VirtualBox and there wasn’t an option to look at SMART results. Since that is a nightly, I didn’t know if it was just missing or maybe moved to a different location. The VMs don’t behave the same as bare metal so it may be just that and SMART tests.
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The “Power On Hours Ago” could be part of what iXsystems is considering some adaptive SMART testing that they plan to bring in. This could be the beginning steps. But they did not release any details on how this adaptive scheduling would work, what the deciding factors are. To me, that is important information to have. Maybe I will agree with the specs they use, maybe I will not.
I have not seen that message as I do not use TrueNAS to run my SMART testing.
That is my best guess.
EDIT: What is SMART Test Results of “slow”? Please tell me it is the name of your pool and not what iXsystems is calling Short testing.
I don’t know how @chri5 got ‘slow’ on that screenshot but I believe it to be the pool name. You can expand the system details and see the pools refered to as fast and slow.
Put in a Bug report since tool tip mentioned both Power On Hours and Power On Hours Ago. We will have to see if this is a Bug or a Feature.
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Yes it’s my pool name ‘slow’ I have another called ‘fast’.
TrueNAS Jira say this isn’t a bug or a regression in functionality. I’d say it is. 
In case you didn’t see