Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
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 > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20101029/a40f9d6d/attachment.htm>