[rrd-users] Adding single datapoints to a RRDdatabase

[Andy Riebs]

The shortest answer: Read the fine documentation that comes with RRDtool.

The slightly longer answer: RRDtool might be the wrong tool for your 
application, especially if you're trying to capture a single datum.

The longer answer: RRDtool captures data over intervals. You need at 
least 2 data points to define an interval. And then you'll need another 
datum to persuade RRDtool that the interval has ended.

HTH!
Andy

cruz wrote:
> Hi,
>
> I'm trying to insert single data points into my RRD database.
>
> Create the database:
>   
>> rrdtool create test.rrd --start 900000000 DS:speed:GAUGE:300:U:U
>> RRA:AVERAGE:0.5:1:24
>>     
> adding data:
>   
>> rrdtool update test.rrd 900000900:1234
>>     
>
> Without adding any further data my '1234' won't occure in the RRA. 
>   
>> rrdtool dump test.rrd
>>     
> [snip]
>     <!-- 1998-07-09 18:10:00 CEST / 900000600 --> <row><v> NaN </v></row>
>     <!-- 1998-07-09 18:15:00 CEST / 900000900 --> <row><v> NaN </v></row>
> </database>
> [/snap]
>
> Neither changing the consolidation function nor tweaking the xfiles factor
> will result in any different behavior. 
> Any ideas how to get my '1234' into the RRA? 
>
>
>
>   

-- 
                                   Progress comes in many flavors!
Andy Riebs,   HP Scalable Computing and Infrastructure / Catalysts
(w) andy.riebs at hp.com      Technology for better business outcomes
    +1.508.467.3002   (In office Tue & Wed, IM or mail other days)
(h) andy at candooz.com   My opinions are not necessarily those of HP

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