I'm trying to upgrade Postgres 9.0 to 9.1 with pg_upgrade. Both versions are installed from the PGDG Yum repo: -bash-4.1$ /usr/pgsql-9.0/bin/postgres -V postgres (PostgreSQL) 9.0.8 -bash-4.1$ /usr/pgsql-9.1/bin/postgres -V postgres (PostgreSQL) 9.1.4 I can successfully start and connect to both 9.0 and 9.1. When I run pg_upgrade, it fails with the error "pg_ctl failed to start the new server," however it apparently does start the new server (output below). Any ideas? This is a freshly installed CentOS 6.2 machine with the 9.0 DB copied over from another machine via streaming replication (which I have since ended and the server is now standalone). Thanks. # su - postgres -bash-4.1$ ps ax | grep postg 4354 pts/0 S 0:00 su - postgres 4389 pts/0 S+ 0:00 grep postg -bash-4.1$ /usr/pgsql-9.1/bin/pg_upgrade -c -b /usr/pgsql-9.0/bin/ -B /usr/pgsql-9.1/bin/ -d /var/lib/pgsql/9.0/data/ -D /var/lib/pgsql/9.1/data/ Performing Consistency Checks ----------------------------- Checking current, bin, and data directories ok Checking cluster versions ok Checking database user is a superuser ok Checking for prepared transactions ok Checking for reg* system oid user data types ok Checking for contrib/isn with bigint-passing mismatch ok pg_ctl failed to start the new server Failure, exiting -bash-4.1$ ps ax | grep postg 4354 pts/0 S 0:00 su - postgres 4445 pts/0 S 0:00 /usr/pgsql-9.1/bin/postgres -D /var/lib/pgsql/9.1/data -p 5432 -b 4446 ? Ss 0:00 postgres: logger process 4448 ? Ss 0:00 postgres: writer process 4449 ? Ss 0:00 postgres: wal writer process 4450 ? Ss 0:00 postgres: stats collector process 4453 pts/0 S+ 0:00 grep postg -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general