On Wed, Jun 23, 2010 at 01:48:03PM -0300, Martin Parodi wrote:
>    rrd files into /var/lib/jffnms/rrd is using 9.9gb and increasing every
>    minute, how can I control it? is there any way to control disk space?
I didn't think rrd files grew, they are at their maximum size when they
are created.  All are my rrd files are the exact same size, or they're
in "sets" of sizes all alike. 811k or 282k.

The quick, short answer: at a guess, adjust your resolution field on the
interface types table.

Long answer...
So your problem can be one of two things:
  a) you have the right number of files, but each file is too big
  b) you are growing the number of files

The first can be fixed, if you want to reduce disk space, by adjusting
the RRAs. It's not that simple though.

RRA is defined by the interface type, it is usually
AVERAGE:0.5:1:<resolution> and resolution is 103680
This means for each stored value is made up of one PDP, or polled value
(that's the 1 in the setup). So each 5 minute poll equals one stored
value.  How many? 103680. This is almost a year's worth of data.
103680 is how many "5 minutes" in 360  days.

If you don't want a years worth of 5 minute data, adjust the resolution
for an interface type.  You can also do more advanced RRA things, but
its best to lookup rrdcreate and friends for that. If you want N days of
of data, you need N * 24 * 12 as the resolution.


Continually getting "new" rrd files usually means there is something
wrong with autodiscovery and it is rediscovering the same interfaces
over and over.  If you are getting this you probably get a lot of
phantom interface down and then new interface discovered events.
Things that dynamically add and drop "interfaces" such as a wireless AP
with its list of peers can also give this problem.

 - Craig
-- 
Craig Small      GnuPG:1C1B D893 1418 2AF4 45EE  95CB C76C E5AC 12CA DFA5
http://www.enc.com.au/                             csmall at : enc.com.au
http://www.debian.org/          Debian GNU/Linux, software should be Free 

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