[DRBD-user] Performance tuning

Daniel Bourque dbourque at weatherdata.com
Wed May 27 17:20:09 CEST 2009

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


you did configure the syncer rate in the dbrbd.conf, right ?

Daniel Bourque
Sr. Systems Engineer
WeatherData Service Inc
An Accuweather Company


Gordan Bobic wrote:
> Have you tried no-disk-flushes, no-md-flushes options?
> http://www.drbd.org/users-guide/re-drbdconf.html
>
> Flushes and/or barriers can cause performance issues on some RAID hardware.
> Make sure you don't disable drain, though.
>
> Gordan
>
> On Wed, 27 May 2009 08:57:02 -0400, David Ruggles <david at safedatausa.com>
> wrote:
>   
>> I've got a gigabit crossover link between two Dell PE 2650s running
>>     
> CentOS
>   
>> 5.3
>>
>> I've tested the link with iperf and it tests out to a 980Mbps link,
>>     
> however
>   
>> drbd only achieves about 5-8 MBps during full sync. (I'm not sure how to
>> see
>> what the normal sync performance is) I would expect to get some where
>> around
>> 100 MBps.
>>
>> I've googled and read everything I can find on optimizing, but nothing
>>     
> I've
>   
>> tried has made a difference. I was hoping someone might have some
>> experience
>> with this config and be able to offer some suggestions (or even just be
>> able
>> to say that's the max on this hardware)
>>
>> TIA
>>
>> Thanks,
>>
>> David Ruggles
>> CCNA MCSE (NT) CNA A+
>> Network Engineer	Safe Data, Inc.
>> (910) 285-7200	david at safedatausa.com
>>
>>
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>> http://lists.linbit.com/mailman/listinfo/drbd-user
>>     
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