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by Dylan16807
23 days ago
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> This is based on the data I had available 10 years ago when I set up this array Data you collected or data you found? Any idea where it was? I've only seen oversimplified math, not real data, and different versions of the math make different assumptions. > I don't know, because I have RAIDZ2, so that read error would probably be corrected without it being reported to me. Zpool status gives you a per-disk error count. I kind of assumed someone doing a resilver would use that command. |
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I think it was a lengthy blog post citing manufacturer data, found via the FreeNAS forums. The added safety of RAIDZ2 was a good tradeoff. Someone else on this thread reports they lost two SSDs in rapid succession, which I hear happens sometimes with drives from the same batch. In any event, I felt no need to launch an independent investigation of the math and underlying assumptions.
> Zpool status gives you a per-disk error count. I kind of assumed someone doing a resilver would use that command.
Yes, I did indeed use zpool to do the resilver… I don't recall if there were any read errors on other drives at the time of those failures, but probably not, as the scrub probably would have flagged it. They've all been replaced with higher capacity drives, so at the moment I see "No known data errors"