[mrtg] Re: wrap redux

[alex at ergens.op.Het.Net]

Randy Bush wrote:
> 
> >> i believe i am getting 32-bit counter wraps on oc12s and above.  the list
> >> archive does have a thread on wraps, but it seems inconclusive or i am just
> >> not getting it.  anyone have some clues for me?
> > Please ask a more specific question if you need more help.
> 
> yes, what's the hack around it?  e.g. how to get the sampling rate more
> frequent than five minutes?  lots of rap about rrd and 14all.cgi, but it
> is not clear in the rap whether/how this works around the issue.

It is completely legal to call MRTG more often than once per 5 minutes
without changing anything in the config file.  This way you will get
more valid samples and therefore the problem is less visible.
One problem will remain:  if the counter wraps from <very high> to
<very low> that sample is ignored.

If you would call MRTG each minute, the counter wrapping occurs at a
rate of ((2**32)/60)*8 == 572662304 bps

Warning: MRTG is pretty demanding on your OS.  RRDtool will process the
counter much more efficient.

regards,
Alex
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