[rrd-users] Beginner question to RRD-Tool

[Arne Götje ( 高盛華 )]

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Hi list,

I have a problem, but maybe the solution is easy and I just don't find
it...

I want to query a network device via SNMP for user statistics. The
device can have between 3000 and 5000 active users, thus one run to
query all users' data takes between 9 and 30 minutes.

I have created the rrds with a step of 900 seconds and a heartbeat of 2
hours. The values get retrieved correctly and inserted into the rrds.
Still, when I use rrdtool fetch to see the stored values, nearly all of
them are 'nan', which means 'unknown' I suppose...

My script to query the data from the network device runs continiously i
a loop with a 30 seconds break between the runs.

Can anyone give me a suggestion what might be the mistake?

The definition for the rrds is as follws:

  RRDs::create ($rrd, "-s", "900",
"DS:in1:COUNTER:7200:U:U", "DS:out1:COUNTER:7200:U:U",
"DS:quota1:GAUGE:7200:U:U",
"DS:in2:COUNTER:7200:U:U", "DS:out2:COUNTER:7200:U:U",
"DS:quota2:GAUGE:7200:U:U",
"DS:in3:COUNTER:7200:U:U", "DS:out3:COUNTER:7200:U:U",
"DS:quota3:GAUGE:7200:U:U",
[...]
"DS:in32:COUNTER:7200:U:U", "DS:out32:COUNTER:7200:U:U",
"DS:quota32:GAUGE:7200:U:U",
                      "RRA:AVERAGE:0.5:1:600",
                      "RRA:AVERAGE:0.5:4:600",
                      "RRA:AVERAGE:0.5:96:600",
                      "RRA:MAX:0.5:1:600",
                      "RRA:MAX:0.5:4:600",
                      "RRA:MAX:0.5:96:600"
                      );

Any mistake here?

Cheers
Arne
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Arne Götje (高盛華) <arne at linux.org.tw>
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