[rrd-users] Re: Some values become NaN...

[Alex van den Bogaerdt]

Michael Bischof wrote:
> Hi,
> 
> I wrote a script that updates every 5 Minute a rrdtool database...
> From time to time some inserted values become NaN ???

The strange thing is that there are not enough NaN ...

> Here is a dump of the rrdtool database:
[snip]

> Here you can see when I've inserted which values:

> [26.07.2000 23:21:27] N:1700217451:3249272098
> [26.07.2000 23:26:28] N:1853471652:3464823810

5 minutes and 1 second apart.  This is 301 seconds


> [27.07.2000 00:01:28] N:2880211733:539269065
> [27.07.2000 00:06:29] N:3008434609:701455961

idem


> [27.07.2000 00:21:28] N:3408894938:1223368486
> [27.07.2000 00:26:29] N:3535319263:1393375162

and idem

> ---rrdtool database---
> ./rrdtool create test.rrd \
>                     DS:inp:COUNTER:300:0:U \
>                     DS:out:COUNTER:300:0:U \

You ask for a heart beat counter of 300.  This means that there
should be an update every 300 seconds.  If you plan to update every
5 minutes you should use another (higher) value for heartbeat.
If you use a heartbeat of 300, all three updates above should fail AFAIK.
Only one does.

One small remark:  Please use the date format that is used in the
rrdtool dump.  This is why:
   [alex at home /tmp/test]$ date -d '26.07.2000 23:45:00' +%s
   date: invalid date `26.07.2000 23:45:00'

   [alex at home /tmp/test]$ date -d '2000-07-26 23:45:00' +%s
   964647900

You'd make life more easy for all who want to help you ... 

regards,
-- 
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