On 2010-11-10 20:52, Sebastian Kayser wrote: > * John Cagle <jcagle@xxxxxxxxx> wrote: >> If the disk is 2TB, then your 100GB test is only using 5% of it-- thus >> your observed IOPS will be a lot better than expected due to >> short-stroking. Right? > > I don't know. The inital 80 IOPS (observed over about 2 full minutes) > made me believe that 100GB would have covered a high enough percentage > to at least eliminate track-to-track seeks. Are short-stroked seeks also > that much faster compared to average seek times? And where would the > steady increase in IOPS during the test come from? > > But you are definitly right when it comes to the test setup. I just > started a test with size=1800g. Looking foward to what that will show. If you have the full device, you could just test on that instead of using a filesystem and file. Just to get more 'raw' performance. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
