Magnus Hagander wrote: > 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. Ah, rsync is a good idea because most of the data is already there. -- Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
