On Fri, Mar 11, 2011 at 13:02, Bruce Momjian <bruce@xxxxxxxxxx> wrote: > Damien Churchill wrote: >> Hi there, >> >> I have done quite a bit of searching but have been unable to find any >> way to do this. I am quite keen to use PostgreSQL 9.0's streaming >> replication to create a master/slave write/read setup. However I am >> unsure of an upgrade procedure whilst using streaming replication that >> doesn't yield any downtime (including being able to write). From what >> I have read the WAL won't be compatible between 9.0 and 9.1 so it >> won't be possible to take the slave off-line and upgrade it, promote >> it to master and then upgrade the old master. >> >> So I was wondering if anyone knows of a method that allows you to do >> this. Sorry if this is an often asked question and I just haven't been >> able to find the answer. > > Good question. I think you have to disconnect the slave, use pg_upgrade > to upgrade the master, and make a new slave. It is something we had not > considered. I don't think you can run pg_upgrade on the slave and have > it work. No, you can't. Because it gets a new systemid and things like that. If you use rsync to push from the master to the slave, the re-provisioning of the slave will be fairly quick, but again it's well above zero. -- Magnus Hagander Me: http://www.hagander.net/ Work: http://www.redpill-linpro.com/ -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
