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Glacier’s actual storage backend technology has never been disclosed, although this is plausible. Other proposed technologies are racks of older (less efficient) disks that are not always spun up, huge slow flash memory banks, et c.


It's expensive enough to be anything but ssds really. Glacier is more expensive that b2 from backblaze and they use hot storage regular HDDs

And that's not taking into account the extra money Amazon makes from the requests and data transfer that could offset storage costs.

I wouldn't be surprised if the glacier data was mixed right in with s3 storage. Just deprioritized when io is high.


Some past hacker news thread made a plausible case for 12" optical disks, much like bluray.




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