On Sat, Mar 29, 2008 at 04:25:31PM -0400, Bill Davidsen wrote: > Christian Pernegger wrote: > > The md raid10,f2 generally has modest write performance, if U is a > single drive speed, write might range between 1.5U to (N-1)/2*U > depending on tuning. Read speed is almost always (N-1)*U, which is great > for many applications. Playing with chunk size, chunk buffers, etc, can > make a large difference in write performance. Hmm, I have other formulae for this. raid10,f2 write speed would rather be U*N/2, and read speed be U*N - possibly enhanced by also having bigger chunks than on a regular non-raid disk, and enhanced by lower access times. The formulae are bothe for sequential and random reads. Best regards keld -- 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
