On Sun, Nov 28, 2010 at 7:25 PM, Jeff Wu <cpwu@xxxxxxxxxxxxx> wrote: > > Hi , > > I've recently been using FFSB and iozone to do performance test with Ceph > v0.23 on my platform. > the attachment file are FFSB configuration file and ceph.conf. So you're not using OSD journals in either test configuration? You're going to get pretty terrible write results without a journal. The reads are clearly slower than they should be and you could probably get better results by adjusting the caching behaviors. We haven't done too much work on optimizing read behavior. Could you run "ceph osd tell * bench", then run "ceph -w", and report the results? (That'll just run local benchmarking on the OSD to report the approximate write speed it's capable of.) You can also run "rados -p data bench 60 write", and then "rados -p data bench 0 seq" to get a simpler (better understood) performance test. With this data as a baseline we can start looking at what might be causing trouble. -Greg -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
