From 900f84e27538d44d00650adbfd8349f492f7e4ab Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Sun, 16 Dec 2007 14:03:32 +0000
Subject: [PATCH] Update write-cache docs to mention windows behavior for
various fsync_methods.
Magnus.
---
doc/src/sgml/wal.sgml | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index d1228fdc40c..467c8d46095 100644
--- a/doc/src/sgml/wal.sgml
+++ b/doc/src/sgml/wal.sgml
@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.49 2007/12/10 22:08:36 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.50 2007/12/16 14:03:32 momjian Exp $ -->
<chapter id="wal">
<title>Reliability and the Write-Ahead Log</title>
@@ -65,10 +65,13 @@
write caching. On <productname>FreeBSD</> use
<application>atacontrol</>. (For SCSI disks use <ulink
url="http://sg.torque.net/sg/sdparm.html"><application>sdparm</></ulink>
- to turn off <literal>WCE</>.) On <productname>Windows</> write caching is
- disabled by unchecking <literal>My Computer\Open\{select disk
+ to turn off <literal>WCE</>.) On <productname>Windows</> if
+ <varname>wal_sync_method</> is <literal>open_datasync</> (the default),
+ write caching is disabled by unchecking <literal>My
+ Computer\Open\{select disk
drive}\Properties\Hardware\Properties\Policies\Enable write caching on
- the disk</>.
+ the disk</>. Also on Windows, <literal>fsync</> and
+ <literal>fsync_writethrough</> never use write caching.
</para>
<para>
--
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