So just as an FYI to those who trust these sorts of things, SMART technology is a self reporting thing. The hard drive is more than capable of lying to the data in that system if it protects the manufacture from responsibility of replacing faulty drives. Whats more, it’s actually pretty rare that SMART reports and issue before the drive just sorta… dies someway or another.

It’s not useless technology, but it’s pretty damn close. I don’t even both with any of my setups. I test it by monitoring if the server has issues reading/writing. SMART wont tell me anything before that will.

Source: Was a firmware engineer on hard drives for 10 years.