[Xymon] Custom test with NCV

[Chris.Morris at rwe.com]

Look at rrdtool tune

The tune option allows you to alter some of the basic configuration
values stored in the header area of a Round Robin Database (RRD).

Such as min:max values of ds-name.




-----Original Message-----
From: xymon-bounces at xymon.com [mailto:xymon-bounces at xymon.com] On Behalf
Of Adam Goryachev
Sent: 10 January 2013 14:16
To: xymon at xymon.com
Subject: Re: [Xymon] Custom test with NCV

On 11/01/13 01:04, Michael Beatty wrote:
> This is done in the xymonserver.cfg file.
>
> You need to specify the full string to configure the RRD. By default 
> MIN and MAX are unlimited.  To do so you would need to expand the 
> NCV_slab command as displayed in the documentation "How to setup 
> custom graphs"
>
> NCV_slab="inodecache:GAUGE:600:0:U,dentrycache:GAUGE:600:0:U"
>
> This is in the format data_set:set_type:heartbeat:min:max
>
> If anyone on the Xymon team reads this, I would like to see this added

> to the documentation.
>
I'm assuming I will need to delete my rrd files to make this take
effect. Is there some way to manually adjust the rrd files so that I
don't lose my history (I have 5 months history so far)?

Also, perhaps some method to delete the negative values changing them to
unknowns would be best. I assume that will cause rrd to automatically
determine the value based on the previous and next value, or else just
put a gap on the graph (either of those would be preferable).

Thanks,
Adam

> Michael Beatty
>
> On 01/10/2013 06:47 AM, Adam Goryachev wrote:
>> I have written a couple of custom tests, and they are reporting data 
>> back to xymon, which is then using the NCV to import into a RRD file.
>>
>> However, sometimes the values wrap around, and then my graph gets a 
>> massive negative value showing.
>>
>> How can I tell hobbit to setup the RRD file such that the minimum 
>> valid value is 0, which would at least discard the single wrong
value...
>>
>> Currently, one value has a minimum of -6M while all other values are 
>> between 0 and max of 119000 but I can't see anything on the graph 
>> because of the single massive negative value?
>>
>> I did actually think rrd was smart enough to notice wraps like this, 
>> but perhaps I've created the RRD wrong, or specified something
incorrectly?
>>
>> Thanks,
>> Adam
>>
>
>
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--
Adam Goryachev
Website Managers
Ph: +61 2 8304 0000
adam at websitemanagers.com.au
Fax: +61 2 8304 0001
www.websitemanagers.com.au


-- 
Adam Goryachev
Website Managers
www.websitemanagers.com.au
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