[rrd-users] Re: Some values at nan..

[Alex van den Bogaerdt]

Guenard, Angele wrote:

> rrdtool create AOL_a00286.rrd --start 971880977 --step 1800
> DS:debit:GAUGE:3600:U:U RRA:AVERAGE:0.5:1:45

heartbeat == 3600, expect at most 3600 seconds between
the updates.

[...]

> 971929800:241   971931600:209   971933400:165   971935200:99   971937000:47
> 971938800:2   971946000:78   971947800:418   971949600:668   971951400:378

971938800-971937000=1800 --> good update, value known
971946000-971938800=7200 --> delta time > heartbeat, value unknown

> but this is what I can see at the end in the base:
[...]
> 971938800: 2.0000000000e+000
> 971940600: -1.#IND000000e+000
> 971942400: -1.#IND000000e+000

>  why are there nan values at the begining and in the middle?
> What did I wrong?

What did you do wrong? You really didn't do anything wrong, you just
see what happens if the update process misses more than one sample.

cheers,
-- 
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