[rrd-users] Re: newbie questions

Curby curby.public at gmail.com
Wed Mar 15 21:11:59 MET 2006

On 3/15/06, James Sweeney <jamessweeney at tees.tamus.edu> wrote:
> RRD Users,
> I am a first go-round user and I have some scientific data that I receive daily in the morning that contains 15 minute data from the previous day for various objects. If would like to use RRDTOOL for organizing my data and rapidly generating graphs.  My plan is to create RRDs for each object.  My end goal is to setup a process that parses data, loads the data and creates visualization graphics for daily, weekly, and monthly profiles for each object.  Once the data is inspected it is dumped and archived into a database.  My question(s) are:
> 1.      Does my time shift in receiving data impact my updating the RRD directly (i.e. not creating RRD formatted XML and loading the RRD)? If so how and is it possible to work around?

You'll be fine, the RRD will take the timestamps you give to it, so
use the timestamps of the data collection, not the time of RRD update.

> 2.      Do I need RRAs for each period (daily, weekly, Etc).

That's how I do it, but you could use a single full-resolution RRA,
and rrdtool will consolidate as directed when you graph low-resolution
(weekly or monthly) views.

> 3.      I don't wont to "loose" my 15-minute data; so do I create an RRA that can hold X time of 15 minute data as well?

Yes you can keep 15-minute data for an entire month.  Then you
wouldn't even need weekly or monthly RRAs.


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