If $PGDATA can be a mountpoint for your filesystem, modify it to get a Listing from the mounted filesystem. Such as: if a filesystem is mounted to /var/lib/psql/data and $PGDATA is set to /var/lib/pgsql/information, modify $PGDATA to /var/lib/pgsql/knowledge/knowledge.By default, after you include a 2nd standby that participates in the replication