I will try this now
Thank you Karl !
-----Original Message-----
From: Karl Fischer [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 04, 2008 3:29 PM
To: [email protected]; Guy Fleegman
Subject: Re: [rrd-users] Newbie Question Storing Absolute Values versus
Average
Guy Fleegman wrote:
> Hello:
>
> I have read all the examples I could find on rrd but i have having a
> tough time. The data is not acting in the way I expect.
>
> What I want to do is feed an rrd data from an SNMP get via cron.
>
> The problem however is that i am not getting the data vales recorded
> in the archive the way i think they should be created
> (I am missing something in my understanding)
>
> Here is an example and what i think it means
>
> If I create a rrd with
>
> rrdtool create test3.rrd --start now --step 60 DS:in:GAUGE:120:U:U
> DS:out:GAUGE:120:U:U DS:busyper:GAUGE:120:U:U RRA:LAST:0.5:1:60
>
>
> So if I test this by running
>
> rrdtool updatev N 10:10:10
>
> I get no data showing up
Chris,
if you define a --step 60 the rrd will only accept one update per minute
and creation counts as one update. So if you create the rrd at 21:04:51
and try to update it at 21:04:56 it will not accept the update. However,
if you try to update it after the minute-rollover at 21:05:01, it's goin
to work:
[EMAIL PROTECTED]:/tmp# date ; rrdtool create test3.rrd --start now --step 60 \
DS:in:GAUGE:120:U:U DS:out:GAUGE:120:U:U \
DS:busyper:GAUGE:120:U:U RRA:LAST:0.5:1:60
Wed Jun 4 21:04:51 CEST 2008
[EMAIL PROTECTED]:/tmp# date ; rrdtool updatev test3.rrd N:10:10:10
Wed Jun 4 21:04:56 CEST 2008
return_value = 0
[EMAIL PROTECTED]:/tmp# date ; rrdtool updatev test3.rrd N:10:10:10
Wed Jun 4 21:05:01 CEST 2008
return_value = 0
[1212606300]RRA[LAST][1]DS[in] = 1.0000000000e+01
[1212606300]RRA[LAST][1]DS[out] = 1.0000000000e+01
[1212606300]RRA[LAST][1]DS[busyper] = 1.0000000000e+01
put the following example into a script and call it to see what happens:
--- snip
#!/bin/bash
date "+%Y-%m-%d %T (%s)"
rrdtool create test3.rrd --start now --step 5 DS:in:GAUGE:120:U:U \
DS:out:GAUGE:120:U:U DS:busyper:GAUGE:120:U:U RRA:LAST:0.5:1:60
echo created.
while true; do
date "+%Y-%m-%d %T (%s)"
rrdtool updatev test3.rrd N:10:10:10
sleep 1
done
--- snap
hth
- Karl
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