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<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
+ <ul>
+
+ <li><a href="#filename"><em>filename</em></a></li>
+ <li><a href="#start_b_start_time__default__now__10s_"><strong>-start</strong>|<strong>-b</strong> <em>start time</em> (default: now - 10s)</a></li>
+ <li><a href="#step_s_step__default__300_seconds_"><strong>-step</strong>|<strong>-s</strong> <em>step</em> (default: 300 seconds)</a></li>
+ <li><a href="#ds_dsname_dst_dst_arguments"><strong>DS:</strong><em>ds-name</em><strong>:</strong><em>DST</em><strong>:</strong><em>dst arguments</em></a></li>
+ <li><a href="#rra_cf_cf_arguments"><strong>RRA:</strong><em>CF</em><strong>:</strong><em>cf arguments</em></a></li>
+ </ul>
+
<li><a href="#aberrant_behavior_detection_with_holtwinters_forecasting">Aberrant Behavior Detection with Holt-Winters Forecasting</a></li>
<li><a href="#the_heartbeat_and_the_step">The HEARTBEAT and the STEP</a></li>
<li><a href="#how_to_measure">HOW TO MEASURE</a></li>
<li><a href="#aberrant_behavior_detection_with_holtwinters_forecasting">Aberrant Behavior Detection with Holt-Winters Forecasting</a></li>
<li><a href="#the_heartbeat_and_the_step">The HEARTBEAT and the STEP</a></li>
<li><a href="#how_to_measure">HOW TO MEASURE</a></li>
<p>The create function of RRDtool lets you set up new Round Robin
Database (<strong>RRD</strong>) files. The file is created at its final, full size
and filled with <em>*UNKNOWN*</em> data.</p>
<p>The create function of RRDtool lets you set up new Round Robin
Database (<strong>RRD</strong>) files. The file is created at its final, full size
and filled with <em>*UNKNOWN*</em> data.</p>
-<dl>
-<dt><strong><a name="item_filename"><em>filename</em></a></strong></dt>
-
-<dd>
+<p>
+</p>
+<h2><a name="filename"><em>filename</em></a></h2>
<p>The name of the <strong>RRD</strong> you want to create. <strong>RRD</strong> files should end
with the extension <em>.rrd</em>. However, <strong>RRDtool</strong> will accept any
filename.</p>
<p>The name of the <strong>RRD</strong> you want to create. <strong>RRD</strong> files should end
with the extension <em>.rrd</em>. However, <strong>RRDtool</strong> will accept any
filename.</p>
-</dd>
-<dt><strong><a name="item_time"><strong>--start</strong>|<strong>-b</strong> <em>start time</em> (default: now - 10s)</a></strong></dt>
-
-<dd>
+<p>
+</p>
+<h2><a name="start_b_start_time__default__now__10s_"><strong>--start</strong>|<strong>-b</strong> <em>start time</em> (default: now - 10s)</a></h2>
<p>Specifies the time in seconds since 1970-01-01 UTC when the first
value should be added to the <strong>RRD</strong>. <strong>RRDtool</strong> will not accept
any data timed before or at the time specified.</p>
<p>See also AT-STYLE TIME SPECIFICATION section in the
<em>rrdfetch</em> documentation for other ways to specify time.</p>
<p>Specifies the time in seconds since 1970-01-01 UTC when the first
value should be added to the <strong>RRD</strong>. <strong>RRDtool</strong> will not accept
any data timed before or at the time specified.</p>
<p>See also AT-STYLE TIME SPECIFICATION section in the
<em>rrdfetch</em> documentation for other ways to specify time.</p>
-</dd>
-<dt><strong><a name="item_step"><strong>--step</strong>|<strong>-s</strong> <em>step</em> (default: 300 seconds)</a></strong></dt>
-
-<dd>
+<p>
+</p>
+<h2><a name="step_s_step__default__300_seconds_"><strong>--step</strong>|<strong>-s</strong> <em>step</em> (default: 300 seconds)</a></h2>
<p>Specifies the base interval in seconds with which data will be fed
into the <strong>RRD</strong>.</p>
<p>Specifies the base interval in seconds with which data will be fed
into the <strong>RRD</strong>.</p>
-</dd>
-<dt><strong><a name="item_ds_3ads_2dname_3adst_3adst_arguments"><strong>DS:</strong><em>ds-name</em><strong>:</strong><em>DST</em><strong>:</strong><em>dst arguments</em></a></strong></dt>
-
-<dd>
+<p>
+</p>
+<h2><a name="ds_dsname_dst_dst_arguments"><strong>DS:</strong><em>ds-name</em><strong>:</strong><em>DST</em><strong>:</strong><em>dst arguments</em></a></h2>
<p>A single <strong>RRD</strong> can accept input from several data sources (<strong>DS</strong>),
for example incoming and outgoing traffic on a specific communication
line. With the <strong>DS</strong> configuration option you must define some basic
<p>A single <strong>RRD</strong> can accept input from several data sources (<strong>DS</strong>),
for example incoming and outgoing traffic on a specific communication
line. With the <strong>DS</strong> configuration option you must define some basic
room. Internally, derive works exactly like COUNTER but without
overflow checks. So if your counter does not reset at 32 or 64 bit you
might want to use DERIVE and combine it with a MIN value of 0.</p>
room. Internally, derive works exactly like COUNTER but without
overflow checks. So if your counter does not reset at 32 or 64 bit you
might want to use DERIVE and combine it with a MIN value of 0.</p>
-<dl>
-<dt><strong><a name="item_note_on_counter_vs_derive">NOTE on COUNTER vs DERIVE</a></strong></dt>
-
-<dd>
+<p><strong>NOTE on COUNTER vs DERIVE</strong></p>
<p>by Don Baarda <<a href="mailto:don.baarda@baesystems.com">don.baarda@baesystems.com</a>></p>
<p>If you cannot tolerate ever mistaking the occasional counter reset for a
legitimate counter wrap, and would prefer ``Unknowns'' for all legitimate
<p>by Don Baarda <<a href="mailto:don.baarda@baesystems.com">don.baarda@baesystems.com</a>></p>
<p>If you cannot tolerate ever mistaking the occasional counter reset for a
legitimate counter wrap, and would prefer ``Unknowns'' for all legitimate
setting will eliminate the possibility of mistaking a reset for a counter
wrap.</p>
</dd>
setting will eliminate the possibility of mistaking a reset for a counter
wrap.</p>
</dd>
-</dl>
-</dd>
<dt><strong><a name="item_absolute"><strong>ABSOLUTE</strong></a></strong></dt>
<dd>
<dt><strong><a name="item_absolute"><strong>ABSOLUTE</strong></a></strong></dt>
<dd>
names of data source listed previously in the create command. This is
similar to the restriction that <strong>CDEF</strong>s must refer only to <strong>DEF</strong>s
and <strong>CDEF</strong>s previously defined in the same graph command.</p>
names of data source listed previously in the create command. This is
similar to the restriction that <strong>CDEF</strong>s must refer only to <strong>DEF</strong>s
and <strong>CDEF</strong>s previously defined in the same graph command.</p>
-</dd>
-<dt><strong><a name="item_rra_3acf_3acf_arguments"><strong>RRA:</strong><em>CF</em><strong>:</strong><em>cf arguments</em></a></strong></dt>
-
-<dd>
+<p>
+</p>
+<h2><a name="rra_cf_cf_arguments"><strong>RRA:</strong><em>CF</em><strong>:</strong><em>cf arguments</em></a></h2>
<p>The purpose of an <strong>RRD</strong> is to store data in the round robin archives
(<strong>RRA</strong>). An archive consists of a number of data values or statistics for
each of the defined data-sources (<strong>DS</strong>) and is defined with an <strong>RRA</strong> line.</p>
<p>The purpose of an <strong>RRD</strong> is to store data in the round robin archives
(<strong>RRA</strong>). An archive consists of a number of data values or statistics for
each of the defined data-sources (<strong>DS</strong>) and is defined with an <strong>RRA</strong> line.</p>
to the number of PDPs in the interval. Thus, it ranges from 0 to 1 (exclusive).</p>
<p><em>steps</em> defines how many of these <em>primary data points</em> are used to build
a <em>consolidated data point</em> which then goes into the archive.</p>
to the number of PDPs in the interval. Thus, it ranges from 0 to 1 (exclusive).</p>
<p><em>steps</em> defines how many of these <em>primary data points</em> are used to build
a <em>consolidated data point</em> which then goes into the archive.</p>
-<p><em>rows</em> defines how many generations of data values are kept in an <strong>RRA</strong>.</p>
-</dd>
-</dl>
+<p><em>rows</em> defines how many generations of data values are kept in an <strong>RRA</strong>.
+Obviously, this has to be greater than zero.</p>
<p>
</p>
<hr />
<p>
</p>
<hr />