[rrd-users] Re: Questions about manipulating the data

Alex van den Bogaerdt alex at ergens.op.het.net
Sat Oct 23 15:03:01 MEST 2004

On Mon, Oct 18, 2004 at 08:34:15PM +0200, Philip Lawatsch wrote:

> $rrdtool create /opt/rrd/disk0.rrd -s 60         \
>              DS:used:GAUGE:600:U:U   \
>              DS:free:GAUGE:600:U:U  \
>              RRA:AVERAGE:0.5:1:3000      \

0.5 may need to be adjusted

> Sometimes I wont get data for more than one hour and of course have a 
> hole in the Graph.
> Since this does not look too good I'd like to use the last known value. 
> How can I do this?

or use PREV

> Thus I do a
> 	    CDEF:rused_disk0=used_disk0,UN,0,used_disk0,IF
> To make these values appear as 0 in case there was no data.
> The problem is, i want these values to be 0 only if the time for the 
> value still lies inside the time of the other sources.

Use TIME and IF.

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