svn commit: r249169 - releng/8.4/release/doc/en_US.ISO8859-1/relnotes

[Glen Barber]

Author: gjb (doc,ports committer)
Date: Fri Apr  5 20:41:46 2013
New Revision: 249169
URL: http://svnweb.freebsd.org/changeset/base/249169

Log:
  Document that, although ZFS pool feature flags are available,
  8.4-RC1 and later ZFS pool version defaults to version 28 to
  prevent problems with upgrading to FreeBSD 9.1-RELEASE.
  
  Feature flags can be enabled by explicitly running:
  
  	zpool upgrade <pool>
  
  Approved by:	re (delphij)

Modified:
  releng/8.4/release/doc/en_US.ISO8859-1/relnotes/article.xml

Modified: releng/8.4/release/doc/en_US.ISO8859-1/relnotes/article.xml
==============================================================================
--- releng/8.4/release/doc/en_US.ISO8859-1/relnotes/article.xml	Fri Apr  5 20:24:51 2013	(r249168)
+++ releng/8.4/release/doc/en_US.ISO8859-1/relnotes/article.xml	Fri Apr  5 20:41:46 2013	(r249169)
@@ -190,7 +190,37 @@
       <sect3 id="fs">
 	<title>File Systems</title>
 
-	<para></para>
+	<para>ZFS is upgraded to support zpool feature flags.  ZFS
+	  pool creation defaults to version 28 allowing upgrades to
+	  &os; 9.1-RELEASE, which does not support
+	  zpool feature flags.</para>
+
+	<para>Users who wish to enable these features can upgrade
+	  storage pools created on &os; 8.4-RC1 and later by
+	  running <command>zpool upgrade</command>.</para>
+
+	<para>The new features available are:</para>
+
+	<itemizedlist>
+	  <listitem>
+	    <para><literal>async_destroy</literal>: allows a ZFS
+	      dataset to be destroyed asynchronously, reclaiming space
+	      by a background process.</para>
+	  </listitem>
+
+	  <listitem>
+	    <para><literal>empty_bpobj</literal>: improves performance
+	      and reduces disk space needed by snapshots.</para>
+	  </listitem>
+
+	  <listitem>
+	    <para><literal>lz4_compress</literal>: a new high
+	      performance compression algorithm thatfeatures better
+	      performance and compression ratio than lzjb.</para>
+	  </listitem>
+	</itemizedlist>
+
+	<para>For more information, see &man.zpool-features.7;.</para>
       </sect3>
     </sect2>