Re: pg9 replication over WAN ?

> -----Original Message-----
> From: pgsql-performance-owner(at)postgresql(dot)org [mailto:pgsql-performance-
> owner(at)postgresql(dot)org] On Behalf Of Ben Ciceron
> Sent: Wednesday, October 05, 2011 3:53 PM
> To: pgsql-performance(at)postgresql(dot)org
> Subject: [PERFORM] pg9 replication over WAN ?
>
> Hello,
>
> Has any performance or evaluation done for pg9.x streaming replication
> over WAN ?
> How adequate is the protocol to push WALs over long distance ?
> Any best practice tuning wal_* for WAN ?
>
> Cheers,
> Ben-

Works for us between the middle of the US and the UK. This on some databases
that do a few gig of log files per day.

I keep a large number of wal_keep_segments because I have the disk capacity
for it and the initial rsync takes a while at ~2-4MB/s.

You may find you need to tune the tcp-keep alive settings, but I am not sure
if that was really a change in the setting or a fix to our load balancers
that fixed an issue I was seeing.

Overall I am extremely pleased with streaming replication + read only hot
standby.

-Mark

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