[Nagiosplug-devel] Performance output of the disk plugin

[Jaap Hogenberg]

On Thu, 2004-07-22 at 16:21, Ben Clewett wrote:
> Jaap,
> 
>  From the perspective of PerfParse, this unfortunately does not 
> understand a range of data.  Due to a flaw in the original data 
> structure, it can only store a single value each for the critical and 
> warn values.  Further, it uses these to draw just single line on the 
> graphs.  Considerable work would be required to rebuild the product for 
> a range.
OK , I understand.

> You are the first person I have ever seen who has requested support for 
> this, and as far as I know, not a single plugin uses this format :)
Well, some of my custom check scripts do  ;-)
Until I decided to rip that out , because it confused perfparse  :)


> I do note that the range you specify in this case adds no more 
> information to the output than using threshold values.
Uhm, this particular case is a plugin that reports free space,
so the tresholds are not "upper" treshold but lower tresholds,
meaning that when the value drops BELOW the treshold, a warning or
critical status should be set, with critical < warning

Just using the treshold values would generete these alerts when
exceeding the tresholds. 
That's why I though using ranges would be usefull.

Apart from that, the tresholds that this plugin generates are wrong
anyway : it reports the free space, and the tresholds are not set
to 30 and 10 % (in the example below) but to the values that would be
correct when calculating USED space, i.e. 70 and 90 % 

All together, it sounds like we would be better of having a plugin that
would report on used space percentages than free space .....

Regards, and thanks for the help

Jaap Hogenberg

> Somebody here might correct me on this:  I believe the range is used 
> where an OK range may be either side of a WARN range, which it's self is 
> either side of a CRITICAL range.  Set by specifying overlapping ranges:
> 
>   OK [-WARN--[--CRITIAL--]--WARN-] OK
> 
> Or in reverse where the '@' is used: an OK range sits between a WARN 
> range, which sits between a CRITICAL range:
> 
> ---CRITICAL-]--WARN-] OK [-WARN--[-CRITIAL---
> 
> I do wish to support this one day in PerfParse as this is a powerful 
> option.  If any person here can shine a light on how the ranges should 
> correctly be used, and how to understand overlapping ranges, and most 
> important, will standard plugins be written to use these, and if so, 
> when?  I would be interested in knowing :)
> 
> Regards, Ben.
> 
> 
> Jaap Hogenberg wrote:
> 
> > Hi,
> > 
> > While playing with perfparse 0.99.01 and the nagios plugin check_disk ,
> > it occurs to me that the performance data for this plugin is not
> > correct. When I run the plugin, this is what I get:
> > ( currently using check_disk 1.42 from plugins 1.4.0alpha2 )
> > 
> > 
> > nagios at gilmore:~/cvs/nagiosplug/plugins$ ./check_disk -w 30% -c 10% -p /
> > DISK OK - free space: / 8171 MB (85%);| /=8170MB;6728;8650;0;9612
> > 
> >>From the "plugin developers doc" I gather that the second and third
> > field in the performance data output should be of the "range type"
> > and since we are working with "free space" any value bigger than 
> > the warning and critical tresholds is good , so we need to alert 
> > when the value is inside a range using the "@" sign....
> > 
> > This means the "warn" field should contain  @((max * 100)/10:((max *
> > 100)/30)
> > and the "crit" field should show @[0:]((max * 100) /10
> > 
> > in values:   .... | /=8170MB;@961:2884;@0:961;0;9612
> > 
> > Is this right ?
> > 
> > I have tried to change the code myself, so that I could supply 
> > patches, but my C coding skills are lousy.
> > 
> > I would appriciate the help, and many thanks for the great work done
> > allready!
> > 
> > Regards,
> > Jaap Hogenberg
> > 
> > 
> > 
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