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Actually, I did this math before I posted my comment. What I don't understand is this: With x% annual failure rate, are the failures uniformly distributed over
by nebula 18y ago
Actually, I did this math before I posted my comment.
What I don't understand is this:
With x% annual failure rate, are the failures uniformly distributed over time? I would expect that it's probably a normal distribution over time. (i.e., no failures to very few failures in the beginning, and the failures keep increasing with time).
- bd 18y agoIt's probable that they didn't use 48,000 brand new hard drives, but reused whatever they already had in their datacenters. Which would have a mixture of different drive ages, I guess.
- nebula 18y agoThat's an interesting possibility. But the fact that the article specifically mentions about drive failures and that they use some of RAID to cope with this makes me wonder if they were using old disks. It's probably easier to get all new drives and use them isn't it? On second thoughts though, it might be much easier to tell GFS to make an extra mirror than to make sure that all disks are brand new. So, i buy your line of thinking :)