[rrd-users] Re: Revision to question on expiration

[Mike Bernhardt]

I took a moment to use rrdtool dump and this is indeed the case.
Unfortunately I'm using the precompiled rrdtool.exe on my NT machine, and I
don't want to deal with rebuilding it. I'm using logformat: rrdtool in my
mrtg.cfg files and I need to keep this as automated as possible. I don't see
in the docs a way to change the step value with an argument to rrdtool.

Would this be a wishlist item for Tobi? Then when I have to track something
very closely, like when monitoring packet drops during a test or something,
I could do that.

Or is there another way? 

-----Original Message-----
From: Philip Molter [mailto:philip at datafoundry.net]
Sent: Thursday, February 15, 2001 10:22 AM
To: Mike Bernhardt
Cc: rrd-users at list.ee.ethz.ch
Subject: Re: [rrd-users] Revision to question on expiration


On Thu, Feb 15, 2001 at 10:01:47AM -0800, Mike Bernhardt wrote:
: 
: Sorry for replying to myself, but I need to revise my explanation of
: the problem. Interval: 1. Modification time of .png and .rrd is every 1
: minute as expected.
: 
: What happens is that the .png shows increasing white space for
: 4 minutes, then fills in the white space on the 5th minute. I haven't
spent
: time looking into how to pull data out of the rrd file (I know...) so I
: don't know if it
: has 5 identical entries or if the .png isn't reflecting new data.

This usually means that you've got a step interval of 5 minutes in
your RRD file (which I believe is the default).  You may be pumping
in data every 1 minute, but RRD is only going to put in a new value
every five minutes (an interpolated value from those 1 minute runs).

The solution to this is to either update your RRD to store values
on 1 minute steps (which will make a very large RRD file) or change
your graphing end time to be ( current time - ( current time % 5 ) ).
That's how RRD stores it's data, so your ending time will always
be on the last RRD data step.

* Philip Molter
* DataFoundry.net
* http://www.datafoundry.net/
* philip at datafoundry.net

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