[rrd-users] rrdGraph help

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@rl.ac.uk
================================================== ========

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