If $PGDATA is really a mountpoint for any filesystem, modify it to get a directory inside the mounted filesystem. By way of example: if a filesystem is mounted to /var/lib/psql/knowledge and $PGDATA is about to /var/lib/pgsql/knowledge, adjust $PGDATA to /var/lib/pgsql/knowledge/knowledge. In fact, shielding info durability on multiple node by default https://richardt630iqx6.wikiitemization.com/user