[rrd-users] Re: [rrd] rrdGraph help

[Tobias Oetiker]

Hi Dave,

you can do this by setting UNKNOWN values to INF, known values
to UNKNOWN ... and then draw an AREA with this ...

cheers
tobi

> Hi,
>
> Sometimes my sensor goes offline and the RRD archives contain Unknown datapoints.
> I can set them to zero using CDEF statments. This results in large gaps in
> the graph. (See the first graph at http://tinyurl.com/ve6d8).
>
> Is there a way - similar to the second graph - to fill these gaps to indicate that
> no data is present due to sensor failure. Can someone send me an example?
>
> My rrdgraph scripts sets all UN datapoints to zero, then adds them together.
> When the sensor is down, all RRD files have UN datapoints coincident in time.
>
> /usr/bin/rrdtool graph test.png -t 'Used Storage (TB)' -v 'TB' -s -3m -w500 -h125 -l 0
> DEF:A=A.rrd:Used:MAX DEF:B=B.rrd:Used:MAX
> CDEF:A_u=A,UN,0,A,IF
> CDEF:B_u=B,UN,0,B,IF
> CDEF:AU=A_u,B_u,+
> AREA:AU#00ffff:AU:STACK
>
> Thanks in advance!
>
> Dave
>
> =========================================================
> Dr Dave Kant
> CCLRC eScience Department                      Phone: (+44)|(0) 1235 778178
> Rutherford Appleton Laboratory                Fax:    (+44)|(0) 1235 446626
> Chilton, Didcot, Oxon, OX11 0QX, UK         Email:  D.Kant at rl.ac.uk
> ==========================================================
>
>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902

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