Votes:
I have created a Custom SNMP sensor. Now I want to change the Value Type of this sensor afterwards, from Gauge to Delta or vice-versa.
The web interface does not offer changing this setting. What can I do?
Created on Feb 17, 2010 12:36:42 PM by
Last change on Feb 17, 2010 2:04:39 PM by
5 Replies
Votes:
This article applies to PRTG Network Monitor 12 or later, as well as to previous (deprecated) versions
When defining custom sensors for PRTG one is faced with the option to define the sensor either as a Delta counter (difference per period) or one of several Gauge counters (absolute value).
Basically, when using Delta counters, the difference between the previously scanned value and the new value is computed and the resultant is handled as the monitoring value, i.e. if the first scan returns a value of "4" and the second scan a value of "6", the actual resultant value recorded for the sensor in case would be "2". This resultant is calculated for each scanning interval.
On the other hand, when using Gauge counters the value returned by the monitored device is actually used as the monitoring value. As such if the device returns a value of "2000" this value is logged as the actual sensor value.
The SNMP Custom sensor offers the following Value Types:
Once selected, the sensor type cannot be changed in the PRTG web interface. If you have selected a wrong Value Type, the easiest way to fix this is deleting an existing sensor and adding it anew, using another Value Type setting.
Created on Feb 17, 2010 1:26:26 PM by
Last change on Jun 3, 2014 4:50:51 PM by
Votes:
This article applies to PRTG Network Monitor 7 or later
Editing the PRTG Configuration.dat file is an alternative option, but we do not recommend nor support this option. The following procedure worked in the past, but we can not guarantee that it will work for your setup.
However, this article explains how to edit the XML configuration file to change your sensors.
<snmptype>
abs
</snmptype>
[...]
<decimalmode>
<flags>
<empty/>
</flags>
<cell>
0
</cell>
</decimalmode>
[...]
<mode>
Absolute
</mode>
| Value Type | <snmptype>-Value | <decimalmode>-Value | <mode>-Value |
|---|---|---|---|
| Gauge (unsigned Integer) | abs | 0 | Absolute |
| Gauge (signed Integer) | sign | 0 | Absolute |
| Gauge (Float) | float | 1 | Absolute |
| Delta (Counter) | diff | 0 | Difference |
Created on Feb 17, 2010 1:59:44 PM by
Last change on Apr 18, 2012 11:49:37 AM by
Votes:
In our case we changed the <snmptype> value from abs to float, but the sensor values were still displayed in integer format. By comparison of configuration of two sensors ("float-changed" vs. "float-de-novo") we found, that also the value <decimalmode> must be changed from 0 to 1 to take affect. After server restart all changed values are displayed correctly as decimals.
<decimalmode>
<flags>
<empty/>
</flags>
<cell>
1
</cell>
</decimalmode>
Last change on Jun 4, 2010 12:28:41 PM by
Votes:
As mentioned on the guide, we currently do not recommend or support editing the configuration file to do this change, but you can try to follow the steps.
Created on Feb 16, 2023 3:50:46 AM by
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