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If I remember correctly, JBOD means that if a drive fails the data on the drive is lost. If you have so many disks then you have an expected fail rate of roughly 1.7% per year (according to the popular drive statistics from back blaze).

Isn't it a bit harsh to lose 1.7% of data every year? Why not a dead simple RAID that can tolerate the loss of a disk without data loss?

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Redundancy is handled at a higher layer. They are probably using ceph on top.

A JBOD is as the initialism, they're Just a Bunch of Disks. They are simply enclosures that allow a large number of disks to be hooked up to a server. Any RAID or whatnot would be done on the software side, with Ceph or something similar as another reply states.

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