[rrd-users] Re: RRDs::fetch perl method

steve rader rader at ginseng.hep.wisc.edu
Fri Apr 6 22:36:09 MEST 2001

 > From: "Daniel J McDonald"
 > So, either the -r flag doesn't work, or I've misinterpreted what it does..

"man rrdfetch" for -r reads

 [...] will return data even if no absolute match is possible

I think "absolute match" does not refer to the specified
resolution like you'd think but rather the start/end times.

In other words, the fetch start and end have to exactly align
on a daily boundry.  For example, I find that (with MRTG-ish
RRAs) using

 -r 86400 -s -2days -e -1day 

will fetch 86400 second resolution data 


 -r 86400 -s -25hours -e -1hour

fetches 7200 second resolution data.

Having said that, I can't explain why I find that 

 -r 86400 -s -86400 -e now 

returns 300 second interval resolution data?!

- - - 
systems & network guy
high energy physics
university of wisconsin

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