[rrd-users] Can't retrieve the data I put in

Jason Greguske jason.steven.greguske at hp.com
Fri Sep 1 00:14:56 MEST 2006

Hello everyone,

Beginner question; there must be something fundamental I'm missing:

create the rrd:
# rrdtool create my.rrd \
	DS:trial:COUNTER:1200:0:U  \
	RRA:LAST:0.5:1:288  \   # 5 min for last 24h
	RRA:LAST:0.5:12:168  \  # hourly for last 7 days
	RRA:LAST:0.5:288:120  \ # daily for last 120 days
	RRA:LAST:0.5:2016:104   # weekly for last 2 years

update it (happens every 5 minutes):
# rrdtool update my.rrd -t trial N:34590

fetch the most recent data back out:
# rrdtool fetch my.rrd LAST -s `rrdtool last my.rrd`

I just want to retrieve the most recently added data, exactly as I put
it in, but the fetch command always returns nan's. What am I missing?

Jason Greguske

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