4 ms·

Is there a specific reason why the drives die at the same time? Electricity spike?

• privong 3y ago
  If they're ~identical construction and being mirrored so that they have the same write/read pattern history, it could trigger the same failure mode simultaneously.
  • dizhn 3y ago
    More likely to be from the same bad batch too. There was a post with very detailed comments about this just a few days ago.
    • alias_neo 3y ago
      Why bad? What's considered a good/bad lifetime for these? Mine had ~43000 power on hours, I don't know if that's good or bad for a WD Red (CMR) drive, but they weren't particularly heavily loaded, and their temps were good, so I'm fairly happy with how long they lasted (though longer would have been nice).
      • dizhn 3y ago
        You're right it might be a natural end of life that coincides too.
• wruza 3y ago
  Buying two identical drives has high chances of them being from a single batch, which makes them physically almost identical. It’s a pretty well-known raid-related fact, but some people aren’t aware of it or don’t take it seriously.
  • short_throw 3y ago
    Identical twins may both die of a heart attack, but not usually at the same time. Normally, failures come from some amount of non-repeatability or randomness that the systems weren't robust to. The drive industry is special (in a bad way) in that they can exactly reproduce their flaws, and most people's intuition isn't prepared for that.
• alias_neo 3y ago
  If they're bought together, like mine were, and they have close serials, they've be almost identical; if you then run them in a ZFS mirror like I was, they'll receive identical "load" as well. Since mine had ~43000 hours, they didn't fail prematurely, they just aged out, and since they appear to have been built pretty well, they both aged out at the same time. Annoying for a ZFS mirror, but indicates good quality control in my opinion.