Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
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.