[rrd-users] Re: newbie confused questoin

[Alex van den Bogaerdt]

Matt Ashfield wrote:

> I've read the documentation and have created some rrd's and such, but am
> confused about the inherent way rrdtool works. If I define an rrd such as is
> done in the tutorial, ie:
> 600 5-minute samples:    2   days and 2 hours
> 600 30-minute samples:  12.5 days
> 600 2-hour samples:     50   days
> 732 1-day samples:     732   days
> 
> Doesn't this mean that I only have 50 hours of 5 minute samples right? So
> then how is it that if I graph my data for a time period that extends beyond
> 50 hours ago...say between 150 and 100 hours ago, that I can still get the 5
> minute samples? Doesn't my defined rrd only store it for the past 50 hours?
> Or am I using the second RRA that is good for 12.5 days, and extracting five
> minute samples from that?

I don't understand why you think you can retrieve 5-minute samples...
You write it yourself: the part of the RRD that lasts 12.5 days has
30-minute samples ?!?  You are right in saying that there is only 50
hours worth of 5-minute samples.  If you go back further than 50 hours,
the next RRA is choosen and thus you can't have 5-minute samples.

cheers,
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