On 2011-01-02 05:12, Spelic wrote: > Hello, I just subscribed, I noticed that some 20 days ago there was a > thread on "IOPS higher than expected on randwrite, direct=1 tests" on > this ML. It's curious because I subscribed to report basically the > same thing. > > With Hitachi 7k1000 HDS721010KLA330 (maybe the same drives as > Sebastian) I am seeing the same problem of IOPS too high with FIO, up > to 300 IOPS per disk (up to 500 per disk with storsave=performance on > my 3ware but that's probably cheating). I am doing 4k random writes. > > I followed the discussion, I don't really agree with the point at the > end of the discussion, so I'd like to bump this thread again. > > My impression is that these drives do not honor the flush or FUA. > (Directio uses flush or FUA right? you can be sure that data is on the > platters after directio right? Anyway I also set fsync=1 and nothing > changed) O_DIRECT does not imply flush of FUA, I'm afraid. It arguably should use FUA, but currently it does not. -- 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
