docs: clarify pg_upgrade docs regarding standbys and rsync
authorBruce Momjian <bruce@momjian.us>
Sat, 16 Sep 2017 15:58:00 +0000 (11:58 -0400)
committerBruce Momjian <bruce@momjian.us>
Sat, 16 Sep 2017 15:58:00 +0000 (11:58 -0400)
commitd2bbd6104096b1559c1683d39e2c4e4cfbcada1c
treee741bbfb50e8252672f08a9a5390a4219e69db74
parente8b65986ba0de2daeb5bcedc02fb936b04fe464c
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
doc/src/sgml/ref/pgupgrade.sgml