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

J. Ryan Earl oss at jryanearl.us
Fri Oct 29 19:01:58 CEST 2010


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
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