[CentOS] [SOLVED sort of] DRBD very slow....

[Coert Waagmeester]

On Wed, 2009-07-29 at 11:42 +0400, Roman Savelyev wrote:
> No way in 8.2
> It's a socket option, managed well in 8.3 and later releases.
> If you don't hav large amount of very small syncronius writes, you don't 
> need it.
> ----- Original Message ----- 
> From: "Coert Waagmeester" <lgroups at waagmeester.co.za>
> To: "CentOS mailing list" <centos at centos.org>
> Sent: Monday, July 27, 2009 10:30 AM
> Subject: Re: [CentOS] DRBD very slow....
> 
> 
> >
> > On Mon, 2009-07-27 at 10:18 +0400, Roman Savelyev wrote:
> >> > Invest in a HW RAID card with NVRAM cache that will negate the need
> >> > for barrier writes from the OS as the controller will issue them async
> >> > from cache allowing I/O to continue flowing. This really is the safest
> >> > method.
> >> It's a better way. But socket oprions in DRBD up to 8.2 (Nagel alghoritm)
> >> can decrease performance in large amount of small syncronius writes.
> >>
> >> _______________________________________________
> >> CentOS mailing list
> >> CentOS at centos.org
> >> http://lists.centos.org/mailman/listinfo/centos
> >
> > Hello Roman,
> >
> > I am running drbd 8.2.6 (the standard centos version)
> >
> > How do I disable that nagle algorithm?
> >
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org
> > http://lists.centos.org/mailman/listinfo/centos
> > 
> 
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Hi all,

Just want to thank you for all your help on this so far.
We are now using that server for something else, so at the moment my
DRBD plans are on hold. After playing around with the snd and receive
and max buffer settings, I did manage to crank the speed up to 10MB/sec.


Thanks again for all your help,
Coert