I've got a WD Red and a Seagate Ironwolf drive that are both over 7 years old in my Unraid server. They aren't particularly big (3TB) so replacing them won't be a big deal but I don't see the point in replacing drives that still have reasonable amounts of useful life in them. I'm curious what sort of life others are seeing out of their drives.
They are both CMR drives for what that's worth.