[rrd-users] Re: RRDtool lying about data values

[PAUL WILLIAMSON]

If MRTG is used to create the RRD initially, it will create the 
RRAs with 5 minute resolution, no matter what you put in the 
interval option.

I know this style response drive Alex crazy, but I'm going with 
the flow here...

Paul

>>> <jon.hartman at verizon.com> 01/01/04 02:16AM >>>
I appreciate the quick response, but I don't believe that to be inline
with what I've read. As I understand it, the MRTG 5 minute limitation only
applies if one is using MRTG to store the data. I've heard that once you
apply the logformat command, you can set it as low as one minute.

Can anyone corroborate this and if so, what would be the cause of the
inconsistency?

Thanks again for the help,

-Jon Hartman

-----Original Message-----
From: PAUL WILLIAMSON [mailto:pwilliamson at mandtbank.com] 
Sent: Wednesday, December 31, 2003 8:33 PM
To: rrd-users at list.ee.ethz.ch; Jonathan M. Hartman
Subject: Re: [rrd-users] RRDtool lying about data values


Jon,

If you're still using MRTG to poll the values, 
the minimum you can do is still 5 minutes.  The 
reason is that MRTG still created the RRAs, which 
are still 5 minute samples.

Use something like cacti or a roll your own poller 
and build an MRTG-like utility to stuffthe data into 
the RRD database.

Paul

>>> <jon.hartman at verizon.com> 12/31/03 16:24 PM >>>
I'm using using the following software to monitor link utilization on
network devices:

MRTG 2.9.17-3
RRDtool 1.0.45
14all.cgi

I had started using MRTG alone, then converted to rrdtool and 14all.cgi. I
also dropped my polling interval from 5 minutes to 1. When I look at the
graphs, the values listed under them don't mesh with the data points on
the curve. As one can see in the example:
http://home1.gte.net/jodih/graph.png. The maximum out is stated to be
113.028Mbps, while the graph clearly shows it to be more about 150Mbps.

Is there some sort of math error here?

Thanks in advance,

-Jon Hartman

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