[rrd-developers] Re: (bug?) Incorrectly selecting low-res RRA

Alex van den Bogaerdt alex at ergens.op.het.net
Thu Mar 27 16:49:17 MET 2003

On Thu, Mar 27, 2003 at 01:50:40PM +0000, Phil Radden wrote:

> Now I've been logging a bit longer, I can tell you that it picked the 
> low-res RRA between:
>   Tue Mar 25 2003 00:01 - 00:24 (inclusive)
>   Wed Mar 26 2003 00:01 - 01:36 (inclusive)
> and no other times between Monday lunchtime and now (Thursday afternoon).
> This is all using 1.0.41.
> Any tips?  It's difficult for me to enable any debugging on that system, 
> since it's a very busy production system, but I'll see if I can duplicate 
> enough of the setup somewhere else to replicate the problem.

Look at the time in seconds since the epoch.  Check both "--start"
and "--end", looking for:

a)  a whole multiple of {step*steps} in any of your RRAs
b)  as in (a), but offset by -1*step
c)  as in (a), but offset by +1*step

Test this, on a small section of the database.


rrdtool fetch transfers.rrd AVERAGE --start end-2520 --end 1048778640
rrdtool fetch transfers.rrd AVERAGE --start end-2520 --end 1048778625
rrdtool fetch transfers.rrd AVERAGE --start end-2520 --end 1048778655

Does this produce different results and if so, is this what you're
trying to debug?

Much of what looks like rudeness in hacker circles is not intended to give
offence. Rather, it's the product of the direct, cut-through-the-bullshit
communications style that is natural to people who are more concerned about
solving problems than making others feel warm and fuzzy.


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