[hobbit] RRD and negative values

[Henrik Størner]

In <e409c79311fbdfe0535ccedc3259e996 at localhost> <doctor at makelofine.org> writes:

>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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>>> 
>>> 
>> 
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>> 

>Thank you for your help, your tips is just what I needed.


The fix in Hobbit to always permit negative values has been
added for both the current development version, and the 4.2.3
update.


Regards,
Henrik