Re: [Postgres-xc-general] Our general use case

[Vladimir S. <vst...@gm...>]

On Tue, Nov 6, 2012 at 4:55 AM, Koichi Suzuki <koi...@gm...> wrote:

> Does anybody has performance data for DRBD with PostgreSQL?   The
> following reports that the throughput will become almost half.
>
> http://archives.postgresql.org/pgsql-performance/2007-09/msg00118.php

I've reproduced this test against postgresql-9.1 with similar or even
worse results. Though experiment was not clean because of outsider
load on system, but kernel and drbd are not most recent. This is
confirmed by my other experiment with dd writes where 45% in speed was
lost on drbd. But this is one more argument in favor of internal HA
where we can expect better results.