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

Bo Hansen bh at newtec.dk
Tue Nov 2 07:54:58 CET 2010


Try remove the "data-integrity-alg"-line. I have experienced it as a 
performance killer - and according to the documentation only meant for 
initial testing of the system.

Best regards,
Bo


Bart Coninckx wrote:
> 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.
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
>
>   


More information about the drbd-user mailing list