Re: DRBD very slow....

["Roman Savelyev" <centosmail@xxxxxxxxxxxx>]

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@xxxxxxxxxxxxxxxxx>
To: "CentOS mailing list" <centos@xxxxxxxxxx>
Sent: Monday, July 27, 2009 10:30 AM
Subject: Re:  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.
>>
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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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> 

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