[rrd-users] Re: Weird #'s from basic rrdgraph

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Sat Mar 17 10:37:31 MET 2001

Clifton Royston wrote:
> In the case I was looking at, if I picked a *narrower* time window
> (making sure it was aligned exactly on the width of the MAX RRA, 2
> hours) and queried for the MAX, I got a large MAX value (94.5%.) If I
> picked a wider time window which was a strict superset (included) of
> the narrower time window, but which is not necessarily aligned on the
> width of the MAX RRA, and queried the same DSes on the same data file,
> I got a totally different, and much lower MAX value.

This shouldn't happen.  You are sure that you use the max values
from the max RRA and that you are using the newest rrdtool ?

so: /usr/local/rrdtool-1.0.33/bin/rrdtool
    --end <some number on a 2-hour UTC boundary>
    --start end-<some number representing an even number of hours>
    GPRINT:bytes:AVERAGE:"%6.2lf %sbps"
    GPRINT:maxes:MAX:"%6.2lf %sbps"

This shouldn't produce different results on the maxima for
different RRAs.  I don't know about the perl hooks but this
should not make a difference I guess.

What happens if you use "rrdtool fetch" with that time frame
and with the "--resolution" flag?

 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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