[rrd-users] How to change the samples collection time?

[Michael Chan]

Hi all,

I tried to change the samples collection time from 5
minutes to 15 minutes but failed.

Here are the steps that I have done:

1. Create a rrd with steps = 900 by

rrdtool create router.rrd --step 900 \
DS:ifInOctets:COUNTER:600:U:U \
DS:ifOutOctets:COUNTER:600:U:U \
RRA:AVERAGE:0.5:1:600 \
RRA:AVERAGE:0.5:6:700 \ 
RRA:AVERAGE:0.5:24:775 \
RRA:AVERAGE:0.5:288:797 

2. Change crontab so that the data would be collected
every 15 minutes.

However, I found that no data could be input in
router.rrd. (I use the command "rrdtool fetch
router.rrd AVERAGE" to view data in router.rrd. I c
that all values are "nan".)

Anybody knows what happen?

Thanks a lot!!

Regards,

Michael





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