Date: Wed, 27 Apr 2016 16:27:57 +0530
From: Abhijit Menon-Sen <ams@2ndQuadrant.com>
To: pgsql-hackers@postgresql.org
Cc: Magnus Hagander <magnus@hagander.net>,
	Craig Ringer <craig@2ndquadrant.com>,
	Petr Jelinek <petr@2ndquadrant.com>
Subject: Re: 9.6 and fsync=off
Message-ID: <20160427105756.GB4861@toroid.org>
References: 
 <CAMsr+YGechDvrFj4xwoBWhJ7rW25Avqo+UqcyqbnS=LTFdGJ4g@mail.gmail.com>
 <20160427104307.GA4861@toroid.org>
 <CABUevExGL-FWNP0pyCH_9nY==i1ogP-v8XNXpQyDaEp7u4ypCA@mail.gmail.com>
 <57209AE7.9020906@2ndquadrant.com>
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Here's a patch just to help things along.

-- Abhijit

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diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index f3e3de0..353de2e 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -182,7 +182,9 @@
 
 #wal_level = minimal			# minimal, replica, or logical
 					# (change requires restart)
-#fsync = on				# turns forced synchronization on or off
+#fsync = on				# provide crash safety by flushing disk writes
+					# (disabling this can lead to unrecoverable
+					# data corruption)
 #synchronous_commit = on		# synchronization level;
 					# off, local, remote_write, remote_apply, or on
 #wal_sync_method = fsync		# the default is the first option

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