News for hackers. Stuff that matters.

A comment on The Helium Factor and Hard Drive Failure Rates. Parent comment

Re:The Helium Factor and Hard Drive Failure Rates by titzer on Friday May 04, 2018 @07:16AM (#16993657)
> If you model drive failure as a Poisson Process (each drive flips a coin each day with probability of failure x)

IIRC the Poisson distribution applies when the rate is roughly constant per interval of time, which is not exactly the same as a probability of x per interval of time. (Failures are independent in the latter, not in the former).

[ Parent | on HN ]
Re:The Helium Factor and Hard Drive Failure Rates by mrtnmcc on Friday May 04, 2018 @11:13AM (#16995166)
Please see Poisson Process, which is different than Poisson distribution, http://www.randomservices.org/random/poisson/index.html .. failures are indeed independent.
[ Parent | on HN ]