On Fri, Oct 28, 2011 at 12:12, sheng qiu <herbert1984106@xxxxxxxxx> wrote: > thanks for your help. i have built up the system and run postmark and > iozone to get some performance data. my system contains two machine, > one is set as monitor, mds and osd. another is set as mds and osd. > each osd is a SSD with ext3. At this point, I would advise against running multiple active MDSes. That configuration is not tested well enough, and might be the source of all your troubles. Unfortunately, we do not currently have benchmarks we could share. Our QA work is still currently focused on correctness under heavy stress, not performance. -- 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