>real data in rrd file are: > >1120199400: 3.0000000000e+00 >1120200000: 2.5163305117e+00 >1120200600: 2.4773337700e+00 >1120201200: 2.5148369450e+00 >1120201800: 3.4426964500e+00 >1120202400: 3.5409875000e+00
From: http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/tut/rrdtutorial.en.html (...) One important feature of RRDtool has not been explained yet: it is virtually impossible to collect data and feed it into RRDtool on exact intervals. RRDtool therefore interpolates the data, so they are stored on exact intervals. If you do not know what this means or how it works, then here's the help you seek: Suppose a counter increases by exactly one for every second. You want to measure it in 300 seconds intervals. You should retrieve values that are exactly 300 apart. However, due to various circumstances you are a few seconds late and the interval is 303. The delta will also be 303 in that case. Obviously, RRDtool should not put 303 in the database and make you believe that the counter increased by 303 in 300 seconds. This is where RRDtool interpolates: it alters the 303 value as if it would have been stored earlier and it will be 300 in 300 seconds. Next time you are at exactly the right time. This means that the current interval is 297 seconds and also the counter increased by 297. Again, RRDtool interpolates and stores 300 as it should be. I think this is the problem ;) greez synox -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://lists.ee.ethz.ch/rrd-users WebAdmin http://lists.ee.ethz.ch/lsg2.cgi
