From a84b605a8e235b5a0f7927b2ecc5601ddbfdefb0 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Sat, 29 Dec 2007 17:55:07 +0000
Subject: [PATCH] Document how to control the disk write cache on Solaris.
Zdenek Kotala
---
doc/src/sgml/wal.sgml | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index e459863d5ef..090a133185f 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 1.51 2007/12/16 14:05:12 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.52 2007/12/29 17:55:07 momjian Exp $ -->
<chapter id="wal">
<title>Reliability and the Write-Ahead Log</title>
@@ -65,10 +65,14 @@
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</> if
- <varname>wal_sync_method</> is <literal>open_datasync</> (the default),
- write caching is disabled by unchecking <literal>My
- Computer\Open\{select disk
+ to turn off <literal>WCE</>.) On <productname>Solaris</> the disk
+ write cache is controlled by <ulink
+ url="http://www.sun.com/bigadmin/content/submitted/format_utility.jsp"><literal>format
+ -e</></ulink>. (The Solaris <acronym>ZFS</> file system is safe with
+ disk write-cache enabled because it issues its own disk cache flush
+ commands.) 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</>. Also on Windows, <literal>fsync</> and
<literal>fsync_writethrough</> never do write caching.
--
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