[CentOS] DRBD very slow....

Coert Waagmeester

lgroups at waagmeester.co.za
Mon Jul 27 06:30:33 UTC 2009


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. 
> 
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Hello Roman,

I am running drbd 8.2.6 (the standard centos version)

How do I disable that nagle algorithm?




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