KHB: Real-world disk failure rates: temperature
Posted Jun 18, 2007 3:52 UTC (Mon) by giraffedata
In reply to: KHB: Real-world disk failure rates: temperature
Parent article: KHB: Real-world disk failure rates: surprises, surprises, and more surprises
That puts the question of temperature/failure correlation in a whole different light. The correlation people expect has to do with the idea that if you put a disk drive in a hot environment, it will die sooner than if you put it in a cool environment.
But my guess is that the outside temperature and air flow around the drives doesn't vary among Google's sample, so any temperature difference inside the drive is due to the design of the disk drive. IOW, the correlation shows that the designs that run cooler are also the ones that fail more.
Considering that the engineers do design for and test for failure rates, i.e. the failure rate is the independent variable, I would not expect a drive that runs hotter to fail more. Engineers would have designed it to run that hot.
But I might be convinced that in their struggle to make a drive consume less power, and thus run cooler, the engineers sacrificed longevity. (I don't know enough about disk drive design to know how such a tradeoff would be made, but I'm sure there's a way). That could explain the negative correlation.
to post comments)