Index: doc/src/sgml/wal.sgml
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RCS file: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v
retrieving revision 1.62
diff -c -c -r1.62 wal.sgml
*** doc/src/sgml/wal.sgml	20 Feb 2010 18:28:37 -0000	1.62
--- doc/src/sgml/wal.sgml	27 Feb 2010 01:37:03 -0000
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*** 59,66 ****
     same concerns about data loss exist for write-back drive caches as
     exist for disk controller caches.  Consumer-grade IDE and SATA drives are
     particularly likely to have write-back caches that will not survive a
!    power failure.  Many solid-state drives also have volatile write-back
!    caches.  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</> to turn off
     write caching.  On <productname>FreeBSD</> use
--- 59,69 ----
     same concerns about data loss exist for write-back drive caches as
     exist for disk controller caches.  Consumer-grade IDE and SATA drives are
     particularly likely to have write-back caches that will not survive a
!    power failure, though <acronym>ATAPI-6</> introduced a drive cache
!    flush command that some file systems use, e.g. <acronym>ZFS</>.
!    Many solid-state drives also have volatile write-back
!    caches, and many do not honor cache flush commands by default.
!    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</> to turn off
     write caching.  On <productname>FreeBSD</> use