[DRBD-user] multiple DRBD + solid state drive + 10G Ethernet performance tuning. Help!!

Bart Coninckx bart.coninckx at telenet.be
Fri Oct 29 22:01:52 CEST 2010


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.


More information about the drbd-user mailing list