[rrd-users] ERROR: Unknown CF 'FIRST'

[Morten Bjørnsvik]

Hi

We have MAX,MIN,AVERAGE and LAST
Why aren't there a FIRST?

I have a dynamic period and like to see the change over the displayed period:

VDEF:Dfirst=data,FIRST
VDEF:Dlast=data,LAST
CDEF:Dchange=Dlast,Dfirst,-

I can fetch the data via a 'rrdtool fetch data.rrd -s epoc -e epoc'
I already have the epoc when issuing the graph command, but it is inconvenient.

Is it possible to use another way with any of the other functions or maybe the
DEF-command?

aka:
DEF:start=data.rrd:data:AVERAGE:start=end
VDEF:Dfirst=start,LAST


Thanks
--
Morten Bjørnsvik 
morten.bjornsvik at experian-scorex.no
Experian-Scorex AS, PB 121, 0102 Oslo, Norway