[DRBD-user] Tunning DRBD for small writes

Lin Zhao lin at groupon.com
Wed Jan 16 20:28:01 CET 2013

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


Thanks Felix. Upgraded to 8.3 and able to see reasonable performance.

Lin

On Wed, Jan 16, 2013 at 6:54 AM, Felix Frank <ff at mpexnet.de> wrote:

> Hi,
>
> On 01/10/2013 10:09 PM, Lin Zhao wrote:
> > BTW we are using drbd 8.2
>
> Why?
>
> > On Thu, Jan 10, 2013 at 1:08 PM, Lin Zhao <lin at groupon.com
> > <mailto:lin at groupon.com>> wrote:
> >
> >     All,
> >
> >     I'm setting up a drbd setup for my system, but the poor disk write
> >     performance is really throttling my system, even with Protocol A.
> >     The write speed needs to be 20MB/s to not bottleneck my system.
> >     Anyone has advice tuning for small writes? 10kb writes is the most
> >     common operations my system does.
> >
> >     It doesn't make much sense to me Protocol A performance is so much
> >     off native. Anyone has a theory?
>
> Perhaps it's the ancient DRBD. What kernel is this, anyway?
>
> If upgrading to recent 8.3.x doesn't help, you may want to try tuning
> your tcp buffers, but please do the obvious thing first.
>
> Cheers,
> Felix
>



-- 
Lin Zhao
Data Platform Engineer
3101 Park Blvd, Palo Alto, CA 94306
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