In this example, Pgpool-II is deployed on a different Pgpool-II server than the database and application servers.

There are three configurations of Pgpool-II:

• Single-machine configuration

• Two-machine configuration

• Three-machine configuration

Although the Pgpool-II server can be operated on a single machine, to ensure business continuity, it is recommended to operate the Pgpool-II server using a three-machine configuration in Fujitsu Enterprise Postgres.

If employing a configuration of three or more machines, use an odd number of machines in the configuration.