De-duplication is useful in data backup systems because of the high level of
data redundancy, but I'm not sure whether it is necessary for a
general-purposed fs. If you really want to do so, I will suggest the latter
one. File-level de-dup can be implemented in a user-level application.
As I go
city.
A reliable system should be based on the assumption that the underlying parts
are unreliable. Therefore, we should do as much as possible to make sure the
reliability in our filesystem instead of leaning on the SSDs.
--
Seth Huang
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