On Wed, Jul 03, 2013 at 02:53:27PM +0200, Benoît Canet wrote: > > By the way, I don't know much about journalling techniques. So I'm > > asking you these questions so that either you can answer them straight > > away or because they might warrant a look at existing journal > > implementations like: > > I tried to so something simple and performing for the deduplication usage. > > That explain that there is no concept of transaction and that the journal's > block are flushed asynchronously in order to have an high insertion rate. > > I agree with your previous comment is more a log than a journal.
Simple is good. Even for deduplication alone, I think data integrity is critical - otherwise we risk stale dedup metadata pointing to clusters that are unallocated or do not contain the right data. So the journal will probably need to follow techniques for commits/checksums. Stefan
