Will Murnane schrieb:
Perhaps ZFS could do some very simplistic de-dup here: it has the B-tree entry for the file in question when it goes to overwrite a piece of it, so it could calculate the checksum of the new block and see if it matches the checksum for the block it is overwriting. This is a much simpler case than the global de-dup that's in the works: only one checksum needs to be compared to one other, compared to the needle-in-haystack problem of dedup on the whole pool.
Beware that the default checksum algorithm is not cryptographically safe. You can easily generate blocks with different content but the same checksum.
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