then why is 2.2 so much faster?
> With a 2MB chunksize, I would expect a linear read to touch just one
> drive at a time.
why? i read 8mb cvhunks a time (see the dd) so it should read 3x2mb
chunks easily. anyway, i get the same throughput with 64k, 16k etc..
chunksize.
> With a 4K chunk size, I suspect that an linear read would read from
> all the drives in parallel.
maybe, but it's still exactly as fast: 30mb/s, which is slower than one drive
can do.
-- -----==- | ----==-- _ | ---==---(_)__ __ ____ __ Marc Lehmann +-- --==---/ / _ \/ // /\ \/ / pcg@goof.com |e| -=====/_/_//_/\_,_/ /_/\_\ XX11-RIPE --+ The choice of a GNU generation | | - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/