[DRBD-user] sync rate only 2,204 (1,220) K/sec?

Lars Ellenberg Lars.Ellenberg at linbit.com
Thu Oct 5 17:23:28 CEST 2006


/ 2006-10-05 13:02:44 +0200
\ Bernhard Limbach:
> Yes thank you !!!
> 
> That was it.
> 
> I'm using similar values as Peter now:
> 
>      sndbuf-size       512k; (default)
>      max-buffers      20480;
>      max-epoch-size   16384;
>      unplug-watermark 20480;

btw, it does not harm to use "even" numbers here, like 20000 or 15000...

> And it works! sndbuf-size I left to default as I didn't see much effect.
> 
> Are there any concerns related to these values ??

no. more concern about your write cache in the cciss controller,
and whether it lies to the kernel about having written stuff to disk
when in fact it is only in that (probably not battery backed?) write
cache...

> Still funny why I had high synch rates with my old config and kernel 2.6.16.

different io-scheduler may have a big impact here, too.
or other defaults in the cciss driver module.

-- 
: Lars Ellenberg                                  Tel +43-1-8178292-0  :
: LINBIT Information Technologies GmbH            Fax +43-1-8178292-82 :
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