Hi

In the thread "Rdd graphic spikes" over on -discuss it came to light
(I'd never looked) that OpenNMS only supports the GAUGE and COUNTER
datasource types in the RRD/JRobin backend.

This is given in the source code for 1.7.5 in
source/opennms-services/src/main/java/org/opennms/netmgt/collectd/PersistOperationBuilder.java
 line 64:

/**
  * RRDTool defined Data Source Types NOTE: "DERIVE" and "ABSOLUTE" not
  * currently supported.
  */
 static final String DST_GAUGE = "GAUGE";
 static final String DST_COUNTER = "COUNTER";
 public static final int MAX_DS_NAME_LENGTH = 19;

Can I ask why it is that only those two DS types are supported?

It doesn't seem like it would require much of a patch (I'll try to knock
one together) to support it, but there must be some rationale behind the
comment...

Thanks!

Graeme


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