Re: Postgresql Replication Performance

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.


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Best regards

Aleksej Trofimov