5 ms·
A useful additional metric is the age of the drive at failure. This would determine if the failure rate was constant for the life of the drive (meaning random
by SixSigma 11y ago
A useful additional metric is the age of the drive at failure.
This would determine if the failure rate was constant for the life of the drive (meaning random failure) or is it age related (infant mortality or old age).
25 drives that fail after 1 week plus 25 that fail after 50 weeks is different to 50 drives that fail one per week.
- dsp1234 11y agoLuckily they open source their operational and smart status for all of their drives[0]. This means that you can do this additional analysis (and more). Which is awesome. [0] - https://www.backblaze.com/hard-drive-test-data.html https://www.backblaze.com/hard-drive-test-data.html
- SixSigma 11y agoBrilliant, thanks for letting me know. I'm studying Logistics Engineering and reliability analysis is part of my degree. This will make a great case study :)
- jedberg 11y agoTo save you some time, they did this analysis previously. I can't find it, but the summary was that the failures happen at the two ends and not a lot in the middle. ie. a bunch die early (infant mortality) and the rest die pretty late (old age).
- budmang 11y agoThis was the original blog post where we analyzed hard drive reliability and saw that it followed a bathtub curve: https://www.backblaze.com/blog/how-long-do-disk-drives-last/ https://www.backblaze.com/blog/how-long-do-disk-drives-last/