Hi, Shoaib Mir <shoaib...@gmail.com> writes: > Now Hot-Standby is setup like this... > > A --> B > A --> C > > Now if I will like to do a switch so as to make B the new master and have my > replication look like this: > > B --> C > B --> A > > Where are the steps I need for doing so?
First, you need a common archive somewhere all the 3 servers can read it, and you need to setup the restore_command so that you can use it. Now, you can change the primary_conninfo on C so that it connects to B. I guess that means a restart. Note that you only want to do that once server B is the new master, so has been triggered as such. That means a change of TimeLine, though, so it'll break streaming : that's when you need to read the WALs from the archive, with the restore_command. Then, to have the old master A a slave of the new master B, you need to do a full slave setup here, with base backup and all. I hope we will be able to get cascading support in 9.1 or before so that it's possible to simplify all this by having a "relay" server in the mix, so that you only talk to this one when changing the master. Of course enabling the old master as a slave would still need a full setup from scratch. There has been thoughts on how to bypass the base backup there on -hackers, rather promising, but I don't know of any work having been done yet. Guys are getting 9.0 out the door for now :) Regards, -- dim -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
