From: Aleksej Trofimov <aleksej.trofimov@ruptela.lt>
To: Claudio Freire <klaussfreire@gmail.com>
Cc: sgupta <saurabh.b85@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Postgresql Replication Performance
Date: Thu, 29 Dec 2011 18:05:36 +0200
Message-ID: <4EFC8FD0.9020100@ruptela.lt> (raw)
In-Reply-To: <CAGTBQpa98=qcPDfyGTcXJibjUrNjio=xuYSrq67Bhc7-naqn8A@mail.gmail.com>
References: <1325151184846-5107278.post@n5.nabble.com>
<4EFC7A49.6070107@ruptela.lt>
<CAGTBQpa98=qcPDfyGTcXJibjUrNjio=xuYSrq67Bhc7-naqn8A@mail.gmail.com>
On 12/29/2011 05:00 PM, Claudio Freire wrote:
> Second, is that WAL activity on streaming replication or WAL shipping
> is documented to contain more data than on non-replicated setups. What
> is not clear is how much more data. This not only affects our network
> bandwidth estimations, but also I/O load on the master server, slowing
> writes (and some reads that cannot happen on the slave).
Our database has about 2MB/s writes on the WAL array, we had about 160
IOPS in average when replications was switched off, and 165-170 IOPS in
replication. This I think could be explained with statistical error, so
we have not experienced any I/O load on our master server since
replication was configured.
--
Best regards
Aleksej Trofimov
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To: pgsql-performance@postgresql.org
Cc: aleksej.trofimov@ruptela.lt, klaussfreire@gmail.com, saurabh.b85@gmail.com
Subject: Re: Postgresql Replication Performance
In-Reply-To: <4EFC8FD0.9020100@ruptela.lt>
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