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Re: [hobbit] Questions on "howtograph.txt"
Hi Larry,
On Mon, Feb 06, 2006 at 09:55:35AM -0500, Sherman, Larry, GCM wrote:
>
> I have been attempting to implement NCV graphing in hobbit, on version
> 4.1.2 and have run into a few problems/questions:
>
> First, the question: In the "slab" example, you custom test sends the
> string "inode_cache" but in your NCV_slab entry in hobbitserver.cfg, you
> have "inodecache:GAUGE". How does this work???
Hobbit silently strips everything except letters and numbers from the
dataset name. So "inode_cache" is stripped of the underscore, and
becomes "inodecache". Section 4) of the "howtograph.txt" document
explains this:
4) Arrange for the data to be collected into an RRD file
========================================================
The data is obviously a name-colon-value formatted report, so we'll use the
NCV module in Hobbit to handle it. Hobbit will find two datasets here:
The first will be called "inodecache", and the second "dentrycache"
(note that Hobbit strips off any part of the name that is not a letter
or a number; Hobbit also limits the length of the dataset name to 19
letters max. since RRD will not handle longer names).
> Second, the problem: We have a custom test which checks printer toner
> levels by going to the web page of the printer with lynx. Our test,
> called "toner" sends data in the format:
>
> lj102.toner
>
> black : 67
> cyan : 56
> magenta : 78
> yellow : 43
>
> The data does go into the rrd, but does not appear in the "<last_ds>"
> field, as in your slab example, but rather in the <value> field. Our
> graph shows up, but there is no data in it.
Could you show us the first part of the "rrdtool dump" output for the
RRD file ?
My guess is that you've accidentally defined the RRD datasets with the
"DERIVE" datatype (the default) instead of "GAUGE" which is what you'll
need for this kind of data.
> PS: I have been a BB user since 1999, and moved our servers to hobbit
> last Fall. We absolutely love it. Thanks Henrik!
You're welcome :-)
Regards,
Henrik