|Fra: Alex van den Bogaerdt <[email protected]>
|
|> Hi All
|>
|> I'm extracting statistics from lots of rrds using rrdtool fetch, but it
|> seems like
|> fetch is rather fuzzy about the -s and -e settings
|
|A combination of unfortunate accidents with programming off-by-one errors
|and people not understanding the fencepost error
|http://en.wikipedia.org/wiki/Off-by-one_error#Fencepost_error
|
|What usually helps is to ask for {$start_you_want}+{$offset} to
|{$end_you_want}-{$offset} where offset is choosen such a way that it does
|not make another RRA more suitable. Generally speaking "1" is already
|enough.
Thanks Alex
Decreasing the boundaries with a step on each side seem to work ok. for most
intervals.
I also use the mean(), median() and standard_deviation() so it does not affect
me much.
Thanks for the link to wikipedia article.
--
MortenB
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