Hi, I tried many times with different options of rsync : with rsync -a as explained in the wiki ( http://www.postgresql.org/docs/9.0/interactive/warm-standby.html#STANDBY-SERVER-SETUP), it takes 1h40 for each distant slave and quite all data files are transferred with -c (checksum) or -z (compress) , it takes more time, probably due to checksum time or compress/uncompress time
For example, the rsync commands I am using are for data and logs are (I have 2 databases, 1 tablespace per database): rsync -a /var/opt/hosting/db/slony/pg_xlog/* slave-db01.profiles.bench.pns-si.s1.p.fti.net: /var/opt/hosting/db/slony/pg_xlog/ rsync -a /var/opt/hosting/db/profiles/bench/* slave-db01.profiles.bench.pns-si.s1.p.fti.net: /var/opt/hosting/db/profiles/bench/ rsync -a /var/opt/hosting/db/profiles/profiles/* slave-db01.profiles.bench.pns-si.s1.p.fti.net: /var/opt/hosting/db/profiles/profiles/ More information about version of rsync : jaluce@master-db01:~$ rsync --version rsync version 3.0.7 protocol version 30 Jal 2011/11/14 Cédric Villemain <cedric.villemain.deb...@gmail.com> > 2011/11/13 Jean-Armel Luce <jaluc...@gmail.com>: > > Hi Jerry and Kevin, > > > > Thanks for your answers. > > > > Jerry, I tried as you said with the parameter recovery_target_timeline = > > 'latest' and it works. > > > > I tried on a smaller test database (only 15MB) with PG9.1.1 and only 1 > > slave. > > > > My switchover procedure was : > > > > Step 1 : stop the old master > > /usr/local/pgsql/bin/pg_ctl stop -m immediate -D > > /usr/local/pgsql91/server1/data > > > > Step 2 : promote slave as master : > > touch /usr/local/pgsql91/server2/data/trigger_file > > > > Step 3 : declare the old master as a standby server > > Step 3.1 : vi /usr/local/pgsql91/server1/data/postgresql.conf > > Add hot_standby = on in the postgresql.conf > > > > Step 3.2 Set recovery.conf for old master server (including > > recovery_target_timeline = 'latest') > > cp /usr/local/pgsql91/server1/data/recovery.bkp > > /usr/local/pgsql91/server1/data/recovery.conf > > > > Step 4 : start old master > > /usr/local/pgsql/bin/pg_ctl start -D /usr/local/pgsql91/server1/data & > > > > > > The old master is now a hot_standby of the new master. Replication works > > without rsyncing all data from new master to new slave. > > > > > > Tomorrow, I shall try with PG9.0.3, 3 slaves and a primary database with > 100 > > GB. > > > > Thanks. > > > > Jal > > just for the value : rsync --checksum is the option to use to prevent > copying of identical files (it computes checksum on both side before > sending) > > > -- > Cédric Villemain +33 (0)6 20 30 22 52 > http://2ndQuadrant.fr/ > PostgreSQL: Support 24x7 - Développement, Expertise et Formation >
