[rrd-users] Fetch with --resolution parameter

Leon Stringer leon.stringer at ntlworld.com
Thu May 22 10:39:26 CEST 2008


I've created an RRD database to store a value (server clock offset in
ms). I've created a cron job to add the value every 6 hours. 

I created the file with:

  rrdtool create file.rrd -s 21600 DS:offset:GAUGE:21600:U:U
I add the data with:

  rrdtool update file.rrd timestamp:<val>	

And I query data with:

  rrdtool fetch file.rrd MAX -r 86400 -s 1210766400 -e 1211371200

So I read a value four times a day (every 21600s) and my resolution
(-r) parameter is 4 * 21600 so I'm expecting one value for each day,
i.e. seven values. The difference between start and end values is
also a multiple of 86400. However, I get 29 values.

Can anyone tell me what I'm doing wrong?

Thanks in advance,


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