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263f225965
Although initdb has long discouraged use of a filesystem mount-point directory as a PG data directory, this point was covered nowhere in the user-facing documentation. Also, with the popularity of pg_upgrade, we really need to recommend that the PG user own not only the data directory but its parent directory too. (Without a writable parent directory, operations such as "mv data data.old" fail immediately. pg_upgrade itself doesn't do that, but wrapper scripts for it often do.) Hence, adjust the "Creating a Database Cluster" section to address these points. I also took the liberty of wordsmithing the discussion of NFS a bit. These considerations aren't by any means new, so back-patch to all supported branches.