Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Try remove the "data-integrity-alg"-line. I have experienced it as a performance killer - and according to the documentation only meant for initial testing of the system. Best regards, Bo Bart Coninckx wrote: > On Friday 29 October 2010 21:23:27 wang xuchen wrote: > >> It is a 10G dedicated Ethernet connection. >> >> Commit yourself to constant self-improvement >> >> On Fri, Oct 29, 2010 at 3:12 PM, Bart Coninckx >> > <bart.coninckx at telenet.be>wrote: > >>> On Friday 29 October 2010 20:31:03 wang xuchen wrote: >>> >>>> As I said in my first email. dd test on raw SSD device reaches almost >>>> 100MB/s with 4k block size(which is almost 26,000 IOPS). I apologize >>>> that >>>> >>> I >>> >>> >>>> haven`t mentioned the CPU utilization which is surprisingly low, all >>>> >>> worker >>> >>> >>>> threads and receive threads consume less than 1% CPU individually. That >>>> >>> why >>> >>> >>>> how I come up with the conclusion either my configuration is wrong or >>>> >>> DRBD >>> >>> >>>> replication too slow. >>>> >>>> >>>> Any suggestion is appreciated. >>>> >>>> Ben >>>> >>>> Commit yourself to constant self-improvement >>>> >>>> On Fri, Oct 29, 2010 at 1:01 PM, J. Ryan Earl <oss at jryanearl.us> wrote: >>>> >>>>> On Fri, Oct 29, 2010 at 11:13 AM, Julien Escario >>>>> >>> <escario at azylog.net>wrote: >>> >>>>>> Someone answered me that these preformances are perfectly normal is >>>>>> >>> dual >>> >>> >>>>>> master configuration. >>>>>> >>>>> Someone told you wrong. >>>>> >>>>> >>>>>> Seems to be due to the network latency (first server I/O + network >>>>>> latency + second server I/O + network latency (ACK)) >>>>>> >>>>> You should still be able to get much better than 97MB/sec. I get >>>>> over 800MB/sec with a dual-primary with a backing store capable of >>>>> ~950 MB/sec. >>>>> >>>>> >>>>>> I finally decided that DRBD is unusable in dual primary setup >>>>>> because the performance drop. >>>>>> >>>>> You were using 8.0.16, you should have tried with 8.3.x, 8.3 seems to >>>>> >>> do >>> >>> >>>>> dual-primary a lot better in general. >>>>> >>>>> -JR >>>>> >>>>> _______________________________________________ >>>>> drbd-user mailing list >>>>> drbd-user at lists.linbit.com >>>>> http://lists.linbit.com/mailman/listinfo/drbd-user >>>>> >>> And your DRBD network? >>> > > I read that, but did you test that you have 10G ? > > B. > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user > >