required) and creates one instance of <literal>echo_client</literal> for
each <literal>obdfilter</literal> instance in order to generate I/O
requests directly to the OST.</para>
- <para>For more details, see <xref linkend="dbdoclet.50438212_59319"/>.
+ <para>For more details, see <xref linkend="local_disk_performance"/>.
</para>
</listitem>
<listitem>
particular, pay attention to the listed maximum values listed for each
parameter in the script.</para>
</note>
- <section xml:id="dbdoclet.50438212_59319">
+ <section xml:id="local_disk_performance">
<title><indexterm><primary>benchmarking</primary>
<secondary>local disk</secondary></indexterm>
Testing Local Disk Performance</title>
<para>It is also useful to monitor and record average disk I/O sizes
during each test using the 'disk io size' histogram in the
file <literal>lctl get_param obdfilter.*.brw_stats</literal>
- (see <xref linkend="dbdoclet.50438271_55057"/> for details). These
+ (see <xref linkend="monitor_ost_block_io_stream"/> for details). These
numbers help identify problems in the system when full-sized I/Os are
not submitted to the underlying disk. This may be caused by problems in
the device driver or Linux block layer.</para>
file system. It includes these sections:</para>
<itemizedlist>
<listitem>
- <para><xref linkend="dbdoclet.50438271_83523"/></para>
+ <para><xref linkend="enabling_interpreting_debugging_logs"/></para>
<para>.</para>
</listitem>
</itemizedlist>
<listitem>
<para><literal>brw_stats</literal> – Histogram data characterizing I/O requests to the
OSTs. For more details, see <xref xmlns:xlink="http://www.w3.org/1999/xlink"
- linkend="dbdoclet.50438271_55057"/>.</para>
+ linkend="monitor_ost_block_io_stream"/>.</para>
</listitem>
<listitem>
<para><literal>rpc_stats</literal> – Histogram data showing information about RPCs made by
to that point in the table of calls (<literal>cum %</literal>). </para>
</section>
</section>
- <section xml:id="dbdoclet.50438271_55057">
+ <section xml:id="monitor_ost_block_io_stream">
<title><indexterm>
<primary>proc</primary>
<secondary>block I/O</secondary>
</note>
<para>See also <xref xmlns:xlink="http://www.w3.org/1999/xlink" linkend="lustretuning"/></para>
</section>
- <section xml:id="dbdoclet.50438271_83523">
+ <section xml:id="enabling_interpreting_debugging_logs">
<title><indexterm>
<primary>proc</primary>
<secondary>debug</secondary>