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Hard drive reliability at scale (Changelog Interviews #537)
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How to Calculate Failure Rates for Your Drives
We actually do an interesting calculation because that basic assumption there assumes that all of those drives have been in service for the length of time, the same length of time. And so we count what we call drive days. A drive is in service for one day. That's one drive day. So if you have a drive model, ABC, and there are 10 drives and those 10 drives have beenin service for 10 days, okay, that's 100 drive days for that model. I think, you know, it's the most simplest way to do it. The macro number we're going to come up with, for example, might be like 1.4%, 1.5%. It's
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