In this kind of scenario, I expect the block size to have only a marginal impact.
Indeed if all the CD ISOs are very similar, I would expect that the size of a duplicated chunk to be on average quite big.
The difference between using 128k and 64k for BTRFS is for instance not very big.<p>But except for the block size, I don&#x27;t see other explanation for the differences.<p>Dedup is dedup, so I failed to understand why results between different implementation should lead to such differences at the end (except very incorrect implementation !).