[DRBD-user] Tunning DRBD for small writes

Felix Frank ff at mpexnet.de
Wed Jan 16 15:54:23 CET 2013


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



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