[hobbit] RRD and negative values

[doctor at makelofine.org]

On Mon, 26 Jan 2009 13:52:51 -0600, Daniel J McDonald
<dan.mcdonald at austinenergy.com> wrote:
> On Mon, 2009-01-26 at 18:35 +0100, doctor at makelofine.org wrote:
>> Hi,
>> 
>> I wrote a test reporting voltages from my motherboard's sensors. Those
>> values are positives and negatives (+12V, -12V).
>> I use split NCV to get values in different RRD files, and almost
>> everything
>> is OK, but I don't have any value for the negatives voltages. I added a
-
>> before the numeric value, but I don't get any value in RRD file :
> You need to run rrdtune to set the minimum.
> rrdtool tune -i:lamda=-12
> xymon/data/rrd/host/hardware,Negative_12V_volt.rrd
> 
> (I think that's the syntax).
> 
> Right now your minimum is set to zero.
> 
> 
>> user at host:~$ rrdtool dump 
>> ~xymon/data/rrd/host/hardware,Negative_12V_volt.rrd  |head -50
>> <!-- Round Robin Database Dump --><rrd> <version> 0003 </version>
>>         <step> 300 </step> <!-- Seconds -->
>>         <lastupdate> 1232991020 </lastupdate> <!-- 2009-01-26 18:30:20
>>         CET
>> -->
>> 
>>         <ds>
>>                 <name> lambda </name>
>>                 <type> GAUGE </type>
>>                 <minimal_heartbeat> 600 </minimal_heartbeat>
>>                 <min> 0.0000000000e+00 </min>
>>                 <max> NaN </max>
>> 
>>                 <!-- PDP Status -->
>>                 <last_ds> UNKN </last_ds>
>>                 <value> NaN </value>
>>                 <unknown_sec> 20 </unknown_sec>
>>         </ds>
>> 
>> Could someone told me how to work with negative values ?
>> 
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Thank you for your help, your tips is just what I needed.