[rrd-users] basic rrdtool usage - short intervals

Steve Shipway s.shipway at auckland.ac.nz
Sat Sep 18 03:58:00 CEST 2010

What he said.

You might also want to increase the length of the RRA proportionally, as well, and maybe decrease the DS heartbeat (as you have a shorter step size now).  Also, with a 1-dp RRA, you dont need to have the MIN and MAX, as they will be the same as the AVG for a group of a single point.

Try this:

rrdtool create arcsize.rrd --start N --step 15 DS:arcsize:GAUGE:30:0:5000 RRA:AVERAGE:0.5:1:43920

If you want the 1-hour CDP RRAs as well (for graphing purposes) then just add the original 3 RRA definitions to the end of the statment:

rrdtool create arcsize.rrd --start N --step 15 DS:arcsize:GAUGE:30:0:5000 RRA:AVERAGE:0.5:1:43920 RRA:MIN:0.5:12:3660 RRA:MAX:0.5:12:3660 RRA:AVERAGE:0.5:12:3660

Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
s.shipway at auckland.ac.nz<mailto:s.shipway at auckland.ac.nz>
Ph: +64 9 373 7599 ext 86487

From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] on behalf of Pablo Sanchez [pablo at blueoakdb.com]

The problem is your RRA's are consolidating 12 points:  12 x 15
(second steps) = 180 seconds.

Change your RRA's so they consolidate one step and you'll get what
you're after.
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