I have a fairly modestly sized 49.5TB - 20 disk array (18 Data + Parity + Cache) and was just looking through my disks to see which might be the next to get upgraded (not that I'm out of space yet, but I like to be proactive).  I still have (5) 1.5TB Seagate Drives as the smallest drives in the array, so  mostly likely the next to get upgraded.  I was looking at the SMART reports for these drives and for at least 3 of them the "Power On Hours" seems pretty high... I don't really remember when I built my first unRAID, or if these drives were re-purposed, but the age seems pretty high (the other 2 are in the 2-3.5year range, and could possibly be warranty replacements, but don't remember for sure)

 

I guess I'm just wondering if these metrics are real and/or accurate, and if so, I guess I should count myself lucky that the drives have lived this long.

 

9 Power On Hours 0x0032 018 018 000 Old age Always - 72548 (8y, 102d, 20h)

9 Power On Hours 0x0032 023 023 000 Old age Always - 67989 (7y, 277d, 21h)

9 Power On Hours 0x0032 013 013 000 Old age Always - 76809 (8y, 280d, 9h)

 

Its always been spot on for my equipment. I had recently replaced my 2tb drives since they were approaching 6 years in age and matched up exactly to when I bought them going off my receipts.

 

Its always been spot on for my equipment. I had recently replaced my 2tb drives since they were approaching 6 years in age and matched up exactly to when I bought them going off my receipts.

 

I think they are pretty accurate.

 

I wish there was an attribute reporting the number of hours the drive was spun up, not just powered on. Given that many of my drives are infrequently accessed, and perhaps only spun up a few hours a month, it would be considerably less that the powered on number, and likely more related to drive life. Not that power on hours doesn't affect electrical components, but all the mechnical wear and tear occurs when spinning.