Subject: Re: [GENERAL] 9.0 Streaming Replication Problem to two slaves
From: Devrim GÜNDÜZ <[email-masked]>
To: Scott Marlowe <[email-masked]>
Cc: Michael Best <[email-masked]>, [email-masked]
Date: Tue, 02 Aug 2011 21:05:47 +0300
List-Id: <pgsql-general.postgresql.org>

On Tue, 2011-08-02 at 11:55 -0600, Scott Marlowe wrote:

> > Is this likely that the disks are too slow on the replication 
> > servers, or is something else happening, such as the restoration of
> logs is considerably slower than on the primary?
> 
> Could be.  Are the drives on the slaves much slower?  I'd imagine a
> slave with the same drive setup would be able to keep up. 

We have a customer who generates 150+ xlogs per minute under daily load,
and our first HS installation failed just because of :

* Network was slow (10 Mbit), so could not keep up with WAL files.
* Disks were also slow on slave.

So yeah, that could be it.

Regards,
-- 
Devrim GÜNDÜZ
Principal Systems Engineer @ EnterpriseDB: http://www.enterprisedb.com
PostgreSQL Danışmanı/Consultant, Red Hat Certified Engineer
Community: devrim~PostgreSQL.org, devrim.gunduz~linux.org.tr
http://www.gunduz.org  Twitter: http://twitter.com/devrimgunduz