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by lazide 1486 days ago
If the data on disk (with no redundant copies) is bad, you’ve (usually) lost data with ZFS. It isn’t ZFS’s fault, it’s the nature of the game.

The poster built a (non redundant) zfs pool on top of a hardware raid6 device. The underlying hardware device had some failed drives, and when rebuilt, some of the underlying data was lost.

ZFS helped by detecting it instead of letting the bad data though like would normally have happened.