Author: jstephens
Date: 2007-07-12 17:14:35 +0200 (Thu, 12 Jul 2007)
New Revision: 7098
Log:
Documented ODirect Cluster config parameter.
Noted limitation (don't use on Linux with kernel < 2.6)
Modified:
trunk/refman-5.1/mysql-cluster.xml
trunk/refman-5.1/news-5.1.xml
Modified: trunk/refman-5.1/mysql-cluster.xml
===================================================================
--- trunk/refman-5.1/mysql-cluster.xml 2007-07-12 14:53:02 UTC (rev 7097)
+++ trunk/refman-5.1/mysql-cluster.xml 2007-07-12 15:14:35 UTC (rev 7098)
Changed blocks: 2, Lines Added: 69, Lines Deleted: 0; 2764 bytes
@@ -5858,6 +5858,67 @@
<listitem>
<indexterm>
+ <primary><literal>ODirect</literal></primary>
+ </indexterm>
+
+ <para id="mysql-cluster-param-ndbd-definition-odirect">
+ <literal>ODirect</literal>
+ </para>
+
+ <para>
+ Enabling this parameter causes <literal>NDB</literal> to
+ attempt using <literal>O_DIRECT</literal> writes for LCP,
+ backups, and redo logs, often lowering
+ <command>kswapd</command> and CPU usage.
+ </para>
+
+ <warning>
+ <para>
+ When using MySQL Cluster or &mccge-series; on Linux,
+ this <literal>ODirect</literal> should be enabled for
+ 2.6 or newer kernels.
+ </para>
+ </warning>
+
+ <para>
+ This parameter was added in the following releases:
+
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ MySQL 5.1.20
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ MySQL 5.1.15-ndb-6.1.11
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ MySQL 5.1.19-ndb-6.2.3
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ MySQL 5.1.19-ndb-6.3.0
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </para>
+
+ <para>
+ <literal>ODirect</literal> is disabled by default.
+ </para>
+ </listitem>
+
+ <listitem>
+ <indexterm>
<primary><literal>RestartOnErrorInsert</literal></primary>
</indexterm>
@@ -8632,6 +8693,14 @@
<entry>IS</entry>
</row>
<row>
+ <entry><literal><link linkend="mysql-cluster-param-ndbd-definition-odirect">ODirect</link></literal></entry>
+ <entry>boolean</entry>
+ <entry>0</entry>
+ <entry>0</entry>
+ <entry>1</entry>
+ <entry>NR</entry>
+ </row>
+ <row>
<entry><literal><link linkend="mysql-cluster-param-ndbd-definition-redobuffer">RedoBuffer</link></literal></entry>
<entry>bytes</entry>
<entry>8M</entry>
Modified: trunk/refman-5.1/news-5.1.xml
===================================================================
--- trunk/refman-5.1/news-5.1.xml 2007-07-12 14:53:02 UTC (rev 7097)
+++ trunk/refman-5.1/news-5.1.xml 2007-07-12 15:14:35 UTC (rev 7098)
Changed blocks: 4, Lines Added: 36, Lines Deleted: 0; 2102 bytes
@@ -928,6 +928,15 @@
<listitem>
<para>
+ <literal>NDB Cluster</literal>: A new configuration parameter
+ <literal>ODirect</literal> causes <literal>NDB</literal> to
+ attempt using <literal>O_DIRECT</literal> writes for LCP,
+ backups, and redo logs, often lowering CPU usage.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
<literal>NDB Cluster</literal>: The server source tree now
includes scripts to simplify building MySQL with SCI support.
For more information about SCI interconnects and these build
@@ -2969,6 +2978,15 @@
</para>
</listitem>
+ <listitem>
+ <para>
+ A new configuration parameter <literal>ODirect</literal>
+ causes <literal>NDB</literal> to attempt using
+ <literal>O_DIRECT</literal> writes for LCP, backups, and
+ redo logs, often lowering CPU usage.
+ </para>
+ </listitem>
+
</itemizedlist>
</section>
@@ -3246,6 +3264,15 @@
</para>
</listitem>
+ <listitem>
+ <para>
+ A new configuration parameter <literal>ODirect</literal>
+ causes <literal>NDB</literal> to attempt using
+ <literal>O_DIRECT</literal> writes for LCP, backups, and
+ redo logs, often lowering CPU usage.
+ </para>
+ </listitem>
+
</itemizedlist>
<para>
@@ -10494,6 +10521,15 @@
</para>
</listitem>
+ <listitem>
+ <para>
+ A new configuration parameter <literal>ODirect</literal>
+ causes <literal>NDB</literal> to attempt using
+ <literal>O_DIRECT</literal> writes for LCP, backups, and
+ redo logs, often lowering CPU usage.
+ </para>
+ </listitem>
+
</itemizedlist>
<para>
| Thread |
|---|
| • svn commit - mysqldoc@docsrva: r7098 - trunk/refman-5.1 | jon | 12 Jul |
