[rrd-users] Re: RRD NaN Problem / Zero Values

[Alex van den Bogaerdt]

On Mon, Nov 15, 2004 at 04:24:02PM +0100, Synox wrote:

> I use TCL to read a logfile, and if there something in it, I want to 
> update it into my RRD.

If there's NOT something in it, you also have information.  You want
to store zero in that case.

> The RRD is set to:
> create c.rrd --step 10 --start 1068908953 DS:unknown:GAUGE:120:0:U 
> RRA:AVERAGE:0.99999:30:400 RRA:AVERAGE:0.99999:180:400 
> RRA:AVERAGE:0.99999:720:400 RRA:AVERAGE:0.99999:8640:800
> 
> (I'm using 0.99999 because I thought I will get less NaN's. )

Don't.  You need to work on the entry part, not on the intermediate
part of rrdtool.  In stead of masking all those NaNs, get rid of them.

> Is there a way to fill in a time range with Zero Values? I can do it 
> with a for-loop, but this takes *a lot* of time.

RRDtool will use a single update to fill more than one step interval.

Set "step" to 10, "heartbeat" to 87000 and you can update once a day
filling 8640 steps with just one update.

You don't want to do this; you want to update more often. You want to
update rrdtool every couple of seconds, using the rate of zero if there's
no data in the logfile.

Alex
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