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    <title>Using Performance Thresholds </title>
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<a name="wp1306243"> </a><h1 class="pTitle">
Using Performance Thresholds

</h1>
<a name="wp1306244"> </a><p class="pBody">
The Performance Manager Configuration Wizard allows you to set up two thresholds that trigger events 
when the monitored traffic exceeds the percent utilization configured. These event triggers can be set as 
either Critical or Warning events that are reported on the DCNM-SAN web client Events browser page.

</p>
<a name="wp1306245"> </a><p class="pBody">
You must choose either absolute value thresholds or baseline thresholds that apply to all transmit or 
receive traffic defined in the collection. Click the <b class="cBold">Use absolute values</b> radio button on the last screen of 
the Performance Manager Configuration Wizard to configure thresholds that apply directly to the 
statistics gathered. These statistics, as a percent of the total link capacity, are compared to the percent 
utilization configured for the threshold type. If the statistics exceed either configured threshold, an event 
is shown on the DCNM-SAN web client Events tab.

</p>
<a name="wp1306246"> </a><p class="pBody">
As an example, the collection has absolute value thresholds set for 60% utilization (for warning) and 
80% utilization (for critical). If Performance Manager detects that the traffic on a 1-Gigabit link in its 
collection exceeds 600 Mbps, a warning event is triggered. If the traffic exceeds 800 Mbps, a critical 
event is triggered.

</p>
<a name="wp1306247"> </a><p class="pBody">
Baseline thresholds are defined for a configured time of day or week (1 day, 1 week, or 2 weeks). The 
baseline is created by calculating the average of the statistical results for the configured time each day, 
week, or every 2 weeks. <a href="perfmon08.html#wp1306254">Table&#160;6-2</a> shows an example of the statistics used to create the baseline value 
for a collection defined at 4 pm on a Wednesday.

</p>
<a name="wp1306273"> </a><p class="pBodyRelative">
</p><div>
<table border="2" cellpadding="2" id="wp1306254table1306251">
  <caption><a name="wp1306254"> </a><div class="pTableTitle">
Table&#160;6-2	Baseline Time Periods for a Collection Started on Wednesday at 4pm

</div>
</caption>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th><a name="wp1306258"> </a><p class="pCellHeading">
Baseline Time Window

</p>
</th>
    <th><a name="wp1306260"> </a><p class="pCellHeading">
Statistics Used in Average Calculation

</p>
</th>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1306262"> </a><p class="pBody">
1 day

</p>
</td>
    <td><a name="wp1306264"> </a><p class="pBody">
Every prior day at 4 pm

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1306266"> </a><p class="pBody">
1 week

</p>
</td>
    <td><a name="wp1306268"> </a><p class="pBody">
Every prior Wednesday at 4 pm

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1306270"> </a><p class="pBody">
2 weeks

</p>
</td>
    <td><a name="wp1306272"> </a><p class="pBody">
Every other prior Wednesday at 4 pm

</p>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp1306274"> </a><p class="pBody">
Baseline thresholds create a threshold that adapts to the typical traffic pattern for each link for the same 
time window each day, week, or every 2 weeks. Baseline thresholds are set as a percent of the average 
(110% to 500%), where 100% equals the calculated average. 

</p>
<a name="wp1306275"> </a><p class="pBody">
As an example, a collection is created at 4 pm on Wednesday, with baseline thresholds set for 1 week, 
at 150% of the average (warning) and 200% of the average (critical). Performance Manager recalculates 
the average for each link at 4 pm every Wednesday by taking the statistics gathered at that time each 
Wednesday since the collection started. Using this as the new average, Performance Manager compares 
each received traffic statistic against this value and sends a warning or critical event if the traffic on a 
link exceeds this average by 150% or 200% respectively.

</p>
<a name="wp1306279"> </a><p class="pBody">
<a href="perfmon08.html#wp1306283">Table&#160;6-3</a> shows two examples of 1-Gigabit links with different averages in our example collection and 
at what traffic measurements the Warning and Critical events are sent.

</p>
<a name="wp1306306"> </a><p class="pBodyRelative">
</p><div>
<table border="2" cellpadding="2" id="wp1306283table1306280">
  <caption><a name="wp1306283"> </a><div class="pTableTitle">
Table&#160;6-3	Example of Events Generated for 1-Gigabit Links

</div>
</caption>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th><a name="wp1306289"> </a><p class="pCellHeading">
Average

</p>
</th>
    <th><a name="wp1306291"> </a><p class="pCellHeading">
Warning Event Sent at 150%

</p>
</th>
    <th><a name="wp1306293"> </a><p class="pCellHeading">
Critical Event Sent at 200%

</p>
</th>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1306295"> </a><p class="pBody">
400 Mbps

</p>
</td>
    <td><a name="wp1306297"> </a><p class="pBody">
600 Mbps

</p>
</td>
    <td><a name="wp1306299"> </a><p class="pBody">
800 Mbps

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1306301"> </a><p class="pBody">
200 Mbps

</p>
</td>
    <td><a name="wp1306303"> </a><p class="pBody">
300 Mbps

</p>
</td>
    <td><a name="wp1306305"> </a><p class="pBody">
400 Mbps

</p>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<a name="wp1306307"> </a><p class="pBody">
Set these thresholds on the last screen of the Collections Configuration Wizard by checking the <b class="cBold">Send 
events if traffic exceeds threshold</b> check box.

</p>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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