pgsql: docs: clarify pg_upgrade docs regarding standbys and rsync

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql: docs: clarify pg_upgrade docs regarding standbys and rsync
Date: 2017-09-16 15:58:13
Message-ID: E1dtFTx-0005oF-1h@gemulon.postgresql.org
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docs: clarify pg_upgrade docs regarding standbys and rsync

Document that rsync is an _optional_ way to upgrade standbys, suggest
rsync option --dry-run, and mention a way of upgrading one standby from
another using rsync. Also clarify some instructions by specifying if
they operate on the old or new clusters.

Reported-by: Stephen Frost, Magnus Hagander

Discussion: https://postgr.es/m/20170914191250.GB6595@momjian.us

Backpatch-through: 9.5

Branch
------
REL9_6_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/c4c45945e27c9fc90b0dcb1d9af7fd6ea5220f81

Modified Files
--------------
doc/src/sgml/ref/pgupgrade.sgml | 41 ++++++++++++++++++++++++-----------------
1 file changed, 24 insertions(+), 17 deletions(-)

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