On Wednesday July 18, ptb@xxxxxxxxxxxxxx wrote: > Did the asynchronous write stuff (as it was in fr1) ever get into kernel > software raid? Hmmm... what was 'fr1' again??.. asks google. http://www.it.uc3m.es/ptb/fr1/ Yes, that sound like the 'bitmap' support currently in md. The bitmap is stored on disk which I think is different from what fr1 did. Possibly having a volatile bitmap would be valuable. It would remove the current extra cost of writes, and would still allow fast recovery if you fail, then re-add a drive... > > I see from the raid acceleration ("ioat") patching going on that some > sort of asynchronicity is being contemplated, but blessed if I can make > head or tail of the descriptions I've read. It looks vaguely like > purely memory-management stuff to me (what?) for external hardware raid, > but what do I know ... Yes. The ,'ioat' is for raid5/6 and allows the xor calculation, memcpys and some other functions to be off-loaded to a co-processor. NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
