No graph from RRD data

Hi all,

Following problem keeps me busy several days now....

I'm using hobbit 4.2.0.

I want to create a custom graph and use ncv to create the rrd file. I receive data from a custom script on the client, a column "usage" appears on the hobbit display. The rrd file is created, but no graph is created, what's wrong??

In the data is a parameter in the following format: usage:1

hobbitserver.cfg is configured: TEST2RRD="cpu=la,disk,.....,usage=ncv" GRAPHS="la,disk,......,usage" NCV_usage="usage:GAUGE"

This works fine, a file named usage.rrd is created.

Dump from usage.rrd: <!-- Round Robin Database Dump --> <rrd> <version> 0001 </version> <step> 300 </step> <!-- Seconds --> <lastupdate> 1164183687 </lastupdate> <!-- 2006-11-22 09:21:27 CET -->

    <ds>
            <name> usage </name>
            <type> DERIVE </type>
            <minimal_heartbeat> 600 </minimal_heartbeat>
            <min> 0.0000000000e+00 </min>
            <max> NaN </max>

            <!-- PDP Status -->
            <last_ds> 1 </last_ds>
            <value> 0.0000000000e+00 </value>
            <unknown_sec> 0 </unknown_sec>
    </ds>

hobbitgraph.cfg is configured: [usage] TITLE Usage YAXIS # Users DEF:u=usage.rrd:usage:AVERAGE COMMENT:\n GPRINT:u:LAST: \: %5.1lf (cur) GPRINT:u:MAX: \: %5.1lf (max) GPRINT:u:MIN: \: %5.1lf (min) GPRINT:u:AVERAGE: \: %5.1lf (avg)\n

Result: no graph is being displayed, what is missing or am I doing wrong?

Regards,

Johan Rutten