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Topic: Hard drive reliability
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John Thomas
Film Handler
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Posts: 75
From: Boston, MA
Registered: Sep 2011
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posted 02-27-2014 02:15 AM
That's a good read, Carsten. On the same topic of drive reliability, something that doesn't often occur to people is the notion of correlated failures:
Wikipedia
quote: In practice, the drives are often the same age (with similar wear) and subject to the same environment. Since many drive failures are due to mechanical issues (which are more likely on older drives), this violates the assumptions of independent, identical rate of failure amongst drives; failures are in fact statistically correlated.[4] In practice, the chances of a second failure before the first has been recovered (causing data loss) is not as unlikely as four random failures. In a study of about 100,000 drives, the probability of two drives in the same cluster failing within one hour was four times larger than predicted by the exponential statistical distribution—which characterizes processes in which events occur continuously and independently at a constant average rate. The probability of two failures in the same 10-hour period was twice as large as predicted by an exponential distribution.
That is to say, if all of your drives were manufactured in the same place, around the same time, and are operating in the same environment, it might not be so weird to lose more than one in a short period of time.
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