[rrd-users] Squared graphs

Tobias Oetiker tobi at oetiker.ch
Wed Jul 4 10:40:11 CEST 2007

Hi Giuseppe,

ther reason for this is the following:

* your RRA intervals are not multiples of eachother, so it is
  possible that a lower resolution rra provides better coverage for
  the interval you are drawing than the higer resolution rra you
  expect to see. RRDtool fetch tries to pick the RRA which provides
  the best coverage for the interval you select.

the solution is the following:

* draw your graph not with --end=now but rather with --end=[now-1RRA

also in recent versions of rrdtool the algorithm for selecting an
rra has been updated slightly to prevent this kind of problem in
some cases.


Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902

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