Hello,
I'm trying to add a new graph to a test using NCV (SPLITNCV actually). I read through the graphing tips, I read several emails that provided hints (not my exact problem but nudged me the right way)...
long story short. I finally got he graph to show up on my test page...but the rrd file doesn't seem to be populating the fields as expected when I run "rrdtool dump". The only thing I can figure is that the test I'm performing doesn't run every 5 minutes but every 15 minutes. Does that matter? I would have expected in the worst case that only every 3rd row would have a value.
What am I missing here? Note, I dropped my test to run every 5 minutes to see if this theory is true.
Is the DS type DERIVE or COUNTER? In that case two successive samples, which are 5 minutes apart, are needed to create one data point in the graph.
As a side note, it would be extremely helpful if the NCV component didn't look at the entire status but required a comment block (for example) to contain it. That way you could keep your data stream isolated from your message. For example:
<!-- NCV data
metric1: 123
metric2: 456
etc
-->
Perhaps you can use the devmon format, which encapsulates the data to trend in an HTML comment section. In that case, one would have to specify "test=devmon" in stead of "test=ncv" in variable TEST2RRD. There is no need for an NCV_Something variable, as the DS definition is included with the data to trend.
My test kept creating an rrd file for a date string that was part of the status message. That's a bit annoying.
There are (at least) two ways to circumvent that problem:
A) Add "*:NONE" to the NCV_Something variable;
B) Replace all occurrences of ":" and "=" outside the NCV part by their HTML equivalent, thus ":" and "=".
Regards,
Wim Nelis.