svn commit: r52581 - head/en_US.ISO8859-1/htdocs/releases/12.0R/relnotes

Author: gjb
Date: Wed Dec  5 16:23:14 2018
New Revision: 52581
URL: https://svnweb.freebsd.org/changeset/doc/52581

Log:
  Document r323923, UFS2 cylinder group check hashes.
  Document r338056, UFS TRIM/BIO_DELETE consolidation.
  Document r338517, UFS TRIM/BIO_DELETE consolidation enabled.
  
  Submitted by:	mckusick
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/en_US.ISO8859-1/htdocs/releases/12.0R/relnotes/relnotes.xml

Modified: head/en_US.ISO8859-1/htdocs/releases/12.0R/relnotes/relnotes.xml
==============================================================================
--- head/en_US.ISO8859-1/htdocs/releases/12.0R/relnotes/relnotes.xml	Wed Dec  5 15:09:39 2018	(r52580)
+++ head/en_US.ISO8859-1/htdocs/releases/12.0R/relnotes/relnotes.xml	Wed Dec  5 16:23:14 2018	(r52581)
@@ -591,7 +591,30 @@
     <sect2 xml:id="storage-general">
       <title>General Storage</title>
 
-      <para>&nbsp;</para>
+      <para revision="323923">The
+	<acronym>UFS</acronym>/<acronym>FFS</acronym> filesystem
+	has been updated to support check hashes to cylinder-group
+	maps.  Support for check hashes is available only for
+	<acronym>UFS</acronym>2.</para>
+
+      <para revision="338056" contrib="sponsor"
+	sponsor="&netflix;">The
+	<acronym>UFS</acronym>/<acronym>FFS</acronym> filesystem has
+	been updated to consolidate
+	<acronym>TRIM</acronym>/<literal>BIO_DELETE</literal>
+	commands, reducing read/write requests due to fewer
+	<acronym>TRIM</acronym> messages being sent
+	simultaneously.</para>
+
+      <para revision="338517" contrib="sponsor"
+	sponsor="&netflix;"><acronym>TRIM</acronym> consolidation
+	support has been enabled by default in the
+	<acronym>UFS</acronym>/<acronym>FFS</acronym> filesystem.
+	<acronym>TRIM</acronym> consolidation can be disabled by
+	setting the <literal>vfs.ffs.dotrimcons</literal>
+	&man.sysctl.8; to <literal>0</literal>, or adding
+	<literal>vfs.ffs.dotrimcons=0</literal> to
+	&man.sysctl.conf.5;.</para>
     </sect2>
 
     <sect2 xml:id="storage-net">
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