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From: Craig Rodrigues <rodrigc@FreeBSD.org>
Date: Sun, 22 Dec 2013 10:58:41 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r259715 - head/release/doc/en_US.ISO8859-1/relnotes
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Author: rodrigc
Date: Sun Dec 22 10:58:40 2013
New Revision: 259715
URL: http://svnweb.freebsd.org/changeset/base/259715

Log:
  Mention ZFS zio nop-write improvement.

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

Modified: head/release/doc/en_US.ISO8859-1/relnotes/article.xml
==============================================================================
--- head/release/doc/en_US.ISO8859-1/relnotes/article.xml	Sun Dec 22 10:52:51 2013	(r259714)
+++ head/release/doc/en_US.ISO8859-1/relnotes/article.xml	Sun Dec 22 10:58:40 2013	(r259715)
@@ -342,6 +342,14 @@
 
         <para revision="252140">Support for L2ARC compression has been added to ZFS.</para>
 
+        <para revision="243524">The zio nop-write improvement from Illumos
+          was imported into &os;. To reduce I/O, nop-write skips overwriting
+          data if the checksum (cryptographically secure) of new data
+          matches the checksum of existing data. It also saves space if
+          snapshots are in use.  This improvement only works only on
+          datasets with enabled compression, disabled deduplication and
+          sha256 checksums.</para>
+
         <para>ZFS will now compare the checksums of incoming writes to
           the checksum of the existing on-disk data and avoid issuing any
           write I/O for data that has not changed. This will reduce I/O