A data hoard with a dozen or more drives spends most of its life mostly idle. Only a fraction of that storage gets touched on any given day, so spinning the rest down to save power looks like an obvious win: a spinning 3.5" drive pulls somewhere around 5-9 watts at idle, versus close to nothing once it’s parked. Multiply that across fifteen or twenty drives and the number looks worth chasing. ...
Burn-in testing catches a bad drive before it ever holds data. Bit rot scrubbing catches silent corruption on drives that are otherwise working fine. Neither one watches a healthy drive for the slow, specific warning signs that show up months or years into its working life, the gradually climbing error counts that mean a drive is dying, not corrupted or defective out of the box. That’s a separate job: ongoing SMART monitoring with an actual alert attached to it, not a dashboard you remember to check every few months. ...
Every drive you own is going to fail eventually. The part that catches people off guard is when. Hard drive failure rates don’t sit flat over a drive’s life, they follow what’s usually called a bathtub curve: a spike of early failures right out of the gate, a long flat stretch of low failure rate through the drive’s useful life, and a rising tail of wear-related failures years later. Burn-in testing exists to deal with that first spike, on your terms, before the drive is holding data you care about. ...
A UPS without a way to talk to your hosts is just an expensive surge protector with a battery in it. It’ll keep the lights on for a few minutes, but the moment that battery runs out, every VM and container you’re running goes down exactly as hard as it would have without a UPS at all, just a little later. The part that actually protects you, a UPS that tells your hosts “power’s out, shut down now while you still can,” is a separate piece of software most people never get around to setting up. Here’s how to size the UPS itself, and how to wire up Network UPS Tools (NUT) so an outage ends in a clean shutdown instead of a dirty one. ...