Update write-cache docs to mention windows behavior for various

fsync_methods.

Magnus.

diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index d1228fdc40ce5790814781b7784e0422fcf72904..467c8d46095c64d5c9ecf7412d4c6d72e7219aa5 100644 (file)
--- a/doc/src/sgml/wal.sgml
+++ b/doc/src/sgml/wal.sgml
@@ -1,4 +1,4 @@
-
+
 
 
  Reliability and the Write-Ahead Log
@@ -65,10 +65,13 @@
    write caching.  On FreeBSD use
    atacontrol.  (For SCSI disks use 
    url="http://sg.torque.net/sg/sdparm.html">sdparm
-   to turn off WCE.)  On Windows write caching is
-   disabled by unchecking My Computer\Open\{select disk
+   to turn off WCE.)  On Windows if
+   wal_sync_method is open_datasync (the default),
+   write caching is disabled by unchecking My
+   Computer\Open\{select disk
    drive}\Properties\Hardware\Properties\Policies\Enable write caching on
-   the disk.
+   the disk.  Also on Windows, fsync and
+   fsync_writethrough never use write caching.