On Mon, 7 Jul 2014, Luis Pabon wrote: > Hi all, > I am working on OSDMonitor.cc:5325 and wanted to confirm the following > read_forward cache tier transition: > > readforward -> forward || writeback || (any && num_objects_dirty == 0) > forward -> writeback || readforward || (any && num_objects_dirty == 0) > writeback -> readforward || forward > > Is this the correct cache tier state transition?
That looks right to me. By the way, I had a thought after we spoke that we probably want something that is somewhere inbetween the current writeback behavior (promote on first read) and the read_forward behavior (never promote on read). I suspect a good all-around policy is something like promote on second read? This should probably be rolled into the writeback mode as a tunable... sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
