Index: doc/src/sgml/wal.sgml
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RCS file: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v
retrieving revision 1.46
diff -c -c -r1.46 wal.sgml
*** doc/src/sgml/wal.sgml	28 Nov 2007 15:42:31 -0000	1.46
--- doc/src/sgml/wal.sgml	10 Dec 2007 14:04:12 -0000
***************
*** 58,65 ****
     while some are write-back, and the
     same concerns about data loss exist for write-back drive caches as
     exist for disk controller caches.  Consumer-grade IDE drives are
!    particularly likely to contain write-back caches that will not
!    survive a power failure.
    </para>
  
    <para>
--- 58,74 ----
     while some are write-back, and the
     same concerns about data loss exist for write-back drive caches as
     exist for disk controller caches.  Consumer-grade IDE drives are
!    particularly likely to have write-back caches that will not survive a
!    power failure.  To check write caching on <productname>Linux</> use
!    <command>hdparm -I</>;  it is enabled if there is a <literal>*</> next
!    to <literal>Write cache</>.  <command>hdparm -W</> can to turn off
!    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
!    controlled by <literal>My Computer\Open\{select disk
!    drive}\Properties\Hardware\Properties\Policies\Enable write caching on
!    the disk</>.
    </para>
  
    <para>