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

wang xuchen ben.wxc at gmail.com
Fri Oct 29 20:31:03 CEST 2010


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
>
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