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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