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Date: Tue, 14 Feb 2012 17:43:03 -0500
From: Bruce Momjian <bruce@momjian.us>
To: PostgreSQL-documentation <pgsql-docs@postgresql.org>
Subject: hdparm doc improvement
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I have applied the attached patch to mention -W _0_ turns off write
caching.  The official Linux docs are unclear that you need a zero
there.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

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diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
new file mode 100644
index 1d1924b..0afb9d6
*** a/doc/src/sgml/wal.sgml
--- b/doc/src/sgml/wal.sgml
***************
*** 73,79 ****
        <para>
          On <productname>Linux</>, IDE drives can be queried using
          <command>hdparm -I</command>; write caching is enabled if there is
!         a <literal>*</> next to <literal>Write cache</>.  <command>hdparm -W</>
          can be used to turn off write caching.  SCSI drives can be queried
          using <ulink url="http://sg.danny.cz/sg/sdparm.html"><application>sdparm</></ulink>.
          Use <command>sdparm --get=WCE</command> to check
--- 73,79 ----
        <para>
          On <productname>Linux</>, IDE drives can be queried using
          <command>hdparm -I</command>; write caching is enabled if there is
!         a <literal>*</> next to <literal>Write cache</>.  <command>hdparm -W 0</>
          can be used to turn off write caching.  SCSI drives can be queried
          using <ulink url="http://sg.danny.cz/sg/sdparm.html"><application>sdparm</></ulink>.
          Use <command>sdparm --get=WCE</command> to check

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