[rrd-users] rrd starting at a certain date

Simon Hobson linux at thehobsons.co.uk
Tue Apr 13 10:20:23 CEST 2010

Stefan M. Brandl wrote:
>Hi there,
>I want to create a rrd-database starting at Friday Feb. 26 2010 and have
>a step of one week.
>If I do
>rrdtool create test.rrd --start 1267056000 --step 604800 
>DS:test:GAUGE:604800:0:U RRA:AVERAGE:0.5:1:100
>the resulting rrd starts at Thursday Feb. 25.
>Regardless how I set the start-date, it is always set to Thursday.
>What am I doing wrong here?

Timezone ?

Your email says +2 (European summer time ?), so midnight by your 
clock is 22:00 UTC. RRCTool only uses UTC.

In any case, the start time in an RRD file is largely irrelevant. 
Once you've done a single update, then that will set the minimum time 
for a future update, and the start time of each consolidated data set 
will be determined by the step time, number of PDPs per CDP, and the 
number of CDPs to keep.

Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
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