[rrd-users] Re: RRA selection

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Sat Sep 8 00:47:50 MEST 2001

Dan Winslow wrote:
> No, I think you may be correct. I think that maybe I need to specify
> RRA:AVERAGE:0.5:1:96        # daily report, 1 point per 15 mins
> RRA:AVERAGE:0.5:96:365      # a year's worth of daily averages...right?

Duh, this is what my brain parsed from your message.  You didn't write
it (in your original message) so I read it wrong.

I think the second RRA will only be used when you ask for a time
range where every pixel is exactly x days (for values >= 1 day)
*and* where the start and end times are both on a day-boundary
(that's UTC time !!!).

Try rrdtool fetch on your data, select start time 999820800 and
end time start+24h.

Now do the same but select end time 'start+24h15m'.

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