On Mon, Apr 25, 2011 at 6:11 PM, Sam Choukri <sam at eventful.com> wrote:
> Hello,
>
> I am maintaining a pair of database servers on CentOS 5 running Posgtres 8.1.18 and Slony 1.2.22 (1 master to 1 slave). I would like to upgrade the database to Postgres 9.0, but I do not have the option of doing a standard drop and restore. Therefore, I'd like to use Slony to replicate from 8.1 to 9.0, then do a switchover.
>
> The release notes for Slony 1.2.22 says it added explicit support for Postgres 9.0 so I'm cautiously optimistic I can do it. But is it a good idea? Any gotchas I should be concerned about?

It's how we upgraded from 8.1 to 8.3 smoothly a year or three ago.
I'd recommend updating slony to the latest version.