[rrd-users] Extracting single values using rrdtool

Mohr James james.mohr at elaxy.com
Wed Apr 15 16:15:10 CEST 2009

Hi All!


I am pretty new to RRD, so please forgive any overly-newbie question. I
did read the doc and googled, but there are a number of holes and I
cannot find the answers I am looking for.


I am developing a dashboard for our company that contains data from
various sources. One is performance data that we write to RRD. In once
RRD file we have the response time for a specific web page. What I am
trying to do is pull out the average  response time over the last hour,
last 24 hours and last week and then display the numeric values in the


I can get the 5-minute averages over the last hour (I think) with this


rrdtool fetch response.rrd AVERAGE -r 300 -s -1h


 The problem is that I get a list of values over the last hour as
opposed to a single value representing the average over the hour.  


It would be fairy straight forward to write something to manually
calculate the average based on the data output, but I was hoping I would
not have to re-invent the wheel.


Any input is appreaciated.





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