Re: postgres in HA constellation

On Tue, Oct 10, 2006 at 10:11:08AM -0500, Jim C. Nasby wrote:
> couldn't setup HA on OpenBSD. The key is just to make sure that you
> never bring up two servers on the same data directory.

I think this highlights exactly what I'm trying to emphasise: in
actual, shared-nothing systems like this, there's no possible
guarantee of "never". There are possible guarantees of "very
rarely". The problem is, you're already trying to address a teeny
portion of the likely events on your machines. So you have to assume
that more than one thing might break at the same time, and have a
recovery plan for it. I submit that a recovery plan of "restore from
pg_dump" is usually not going to be enough if it was worth the cost
and hassle of setting up shared disk failover. YMMV, of course.

A

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