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by moe 5251 days ago
It's a FAQ:

http://xfs.org/index.php/XFS_FAQ#Q:_What_is_the_problem_with...

In summary: XFS used to default to having write-barriers disabled (for performance), which makes it prone to data-loss during power outages. This default has changed nowadays, but you must still review your controller-/disk-cache settings to ensure stuff is really flushed to disk when XFS thinks it is.