[rrd-users] trend woes

Robert Hagens rhagens at envysion.com
Wed May 20 17:35:12 CEST 2009

I have an rrd file with a few weeks of data in it. Using fetch, I can
see I have data points every 5 minutes from before 5/10/09 to current

My RRD file def is 






When I try to use trend like 


graph x --start 1241969266 --end 1242829666
'DEF:rawdata=/usr/local/tools/rrd/envysion.ea.rrd:raw:AVERAGE' \

'CDEF:trend=rawdata,854400,TREND'  \

'VDEF:last=trend,LAST' 'PRINT:last:%2.4lf'


I get nan


It seems I should be able to set the timespan parameter for TREND to 10
days (10*24*60*60). However, I get nan.

If I reduce the timespan to a somewhat random, smaller number (say
850400), then I get a number. 


Any thoughts as to why I am getting nan? There are no nan datapoints in
this time range, I've checked with fetch. 


Using TRENDNAN yields the same result.





Robert Hagens | Chief Technical Officer| Envysion, Inc. 

950 Spruce Street | Louisville, CO 80027

303.590.2365 office | 303.590.2351 fax

rhagens at envysion.com <mailto:rhagens at envysion.com>  | www.envysion.com
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