[rrd-users] problem with lost of data, file size always the same!

fredrik at n-mental.com fredrik at n-mental.com
Fri Oct 3 13:20:47 CEST 2008

Please read the documentation..

"In case of linear databases, new data gets appended at the bottom of the
database table. Thus its size keeps on increasing, whereas the size of an
RRDtool database is determined at creation time. Imagine an RRDtool
database as the perimeter of a circle. Data is added along the perimeter.
When new data reaches the starting point, it overwrites existing data. This
way, the size of an RRDtool database always remains constant. The name
"Round Robin" stems from this behavior."

On Fri, 03 Oct 2008 13:07:46 +0200, Francesco Andreozzi
<francesco.andreozzi at gamestorm.it> wrote:
> Hi all, this is my first post and i hope to be clear :D
> i have start to using rrd because seems to be really nice stuff....
> i create a lot of rrd to collect data from a specific device ...
> i create an rrd with the command like this
> rrdtool create <RRDNAME.rrd> --start <my-date> \
>          DS:<my-obj>:GAUGE:<my-time>0:U \
>          RRA:MIN:0.5:12:1440 \
>          RRA:MAX:0.5:12:1440 \
>          RRA:AVERAGE:0.5:1:1440
> the collection seems to be good except i'm lost some data!!!...
> if i do a rrdtool dump I can see min and max value from the starting  
> time, but avarage no, the first values are lost every 5 minutes, when  
> i do the rrdtool update!
> the file size is always the same and it doesn't increase!
> when i'm creating graph i really want to use avarage values! but on  
> this way i think i will gona lost all this information!
> please help me.
> and ask if you need more infos to help me.
> Ciao
> Francesco
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