I occasionally get questions about how to run pg_upgrade on log-shipping
standby servers.  The attached documentation patch outlines how to do

I don't think we can assume that because pg_upgrade was run on the
master and standby that they are binary identical, can we?  Technically
the user file are identical, but the system catalogs and WAL might be
different, hence my suggestion to run rsync before allowing the standby
to rejoin the primary.

  Bruce Momjian  <br...@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +
diff --git a/doc/src/sgml/pgupgrade.sgml b/doc/src/sgml/pgupgrade.sgml
new file mode 100644
index 30f4544..3743599
*** a/doc/src/sgml/pgupgrade.sgml
--- b/doc/src/sgml/pgupgrade.sgml
*************** psql --username postgres --file script.s
*** 518,523 ****
--- 518,530 ----
+    While a Log-Shipping Standby Server (<xref linkend="warm-standby">) can
+    be upgraded, the server must be in changed to a primary server to allow
+    writes, and after the upgrade it cannot be reused as a standby server.
+    (Running <command>rsync</> after the upgrade allows reuse.)
+   </para>
+   <para>
     If you want to use link mode and you do not want your old cluster
     to be modified when the new cluster is started, make a copy of the
     old cluster and upgrade that in link mode. To make a valid copy
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