> > But they include an assumption. > > > > The query is: are async writes and reads sequential? The > > two specific cases are; > > > > 1) Are all reads that are initiated in time after a write > > guaranteed to occur after that write has taken affect? > > > > Yes > Excellent. > > > > 2) Are all writes that are initiated in time after a write (x) > > guaranteed to occur after that write (x) has taken > > affect? > > > > Only overlapping offsets/regions retain causal ordering of completion. It > is write-behind which acknowledges writes pre-maturely and therefore the > layer which must maintain the 'effects' for further reads and writes by > making the dependent IOs (overlapping offset/regions) wait for previous > write's actual completion. > Ok, that should do the trick. Let me mull over this for a while .. Thanks for that info. > Avati > -- Ian Latter Late night coder .. http://midnightcode.org/
