[Xymon] rrd graphs in Xymon

David Baldwin david.baldwin at ausport.gov.au
Tue Jan 29 23:36:41 CET 2013 

Neil,
>
> Hi all,
>
>  
>
> I’ve got an unusual issue at the moment with Graphs.
>
>  
>
> I’ve written a script to collect Average Disk Queue Length from
> Windows servers and am looking to add a graph.
>
>  
>
> I’ve configured the data as NCV in Xymonserver.cfg and I’ve created
> the graph definitions. Unfortunately because I have different number
> of disks on each server it’s not working unless the server has exactly
> the number of disks that I have set up in the graph definition.
>
>  
>

> At the moment the only 2 ways I can think of to get around this is to
> either have a different column name for each server (which would be
> very messy) or to change my script so that it will output lines for 10
> disks even if it only has 1, so for example I would have this,
>
>  
>
> Disk0 : 1
>
> Disk1 :
>
> Disk2 :
>
> Disk3 :
>
> Disk4 :
>
> Disk5 :
>
> Disk6 :
>
> Disk7 :
>
> Disk8 :
>
> Disk9 :
>
>  
>
> Not as messy as the different columns but still a bit untidy.
>
>  
>
> Does anyone know a way to define a graph so that it will still work
> even if it doesn’t find data in the rrd file for one or more of the
> DEF statements in the graph definition?
>

Only general/practical way to do this is to have an RRD for each disk. I
have done the same thing you are trying to do using devmon and
SNMP-Informant which exposes WMI data through SNMP. Then you can choose
to display 1 graph per disk or group a number together.

devmon sends its data via the status message as below:

<!--DEVMON RRD: dperf 0 0
DS:qlen:GAUGE:600:0:U DS:bps:GAUGE:600:0:U DS:rbps:GAUGE:600:0:U DS:wbps:GAUGE:600:0:U
C 0:124800:0:124767
D 0:0:0:0
Total 0:124774:0:124767
HarddiskVolume1 0:0:0:0
-->


The same thing can be done with a data message to trends pseudo-column
(good idea to also send a status message to create a page with current
data values) which I have done with various Powershell monitoring
scripts - note 1 block per disk, but the RRD definitions are repeated:

data myhost.trends
[dperf.C.rrd]
DS:qlen:GAUGE:600:0:U 0
DS:bps:GAUGE:600:0:U 124800
DS:rbps:GAUGE:600:0:U 0
DS:wbps:GAUGE:600:0:U 124767

[dperf.D.rrd]
DS:qlen:GAUGE:600:0:U 0
DS:bps:GAUGE:600:0:U 0
DS:rbps:GAUGE:600:0:U 0
DS:wbps:GAUGE:600:0:U 0

...

The graph definitions:

[dperf]
        FNPATTERN dperf.(.+).rrd
        TITLE Disk Performance
        YAXIS Bytes / sec
        DEF:qlen at RRDIDX@=@RRDFN@:qlen:AVERAGE
        DEF:bps at RRDIDX@=@RRDFN@:bps:AVERAGE
        DEF:rbps at RRDIDX@=@RRDFN@:rbps:AVERAGE
        DEF:wbps at RRDIDX@=@RRDFN@:wbps:AVERAGE
        LINE2:qlen at RRDIDX@#@COLOR@:@RRDPARAM@
        GPRINT:qlen at RRDIDX@:LAST:QLen  \: %5.1lf (cur)
        GPRINT:qlen at RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:qlen at RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:qlen at RRDIDX@:AVERAGE: \: %5.1lf (avg)\n
        LINE2:bps at RRDIDX@#@COLOR@:@RRDPARAM@
        GPRINT:bps at RRDIDX@:LAST:TotalBPS    \: %5.1lf (cur)
        GPRINT:bps at RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:bps at RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:bps at RRDIDX@:AVERAGE: \: %5.1lf (avg)\n
        LINE2:rbps at RRDIDX@#@COLOR@:@RRDPARAM@
        GPRINT:rbps at RRDIDX@:LAST:ReadBPS    \: %5.1lf (cur)
        GPRINT:rbps at RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:rbps at RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:rbps at RRDIDX@:AVERAGE: \: %5.1lf (avg)\n
        LINE2:wbps at RRDIDX@#@COLOR@:@RRDPARAM@
        GPRINT:wbps at RRDIDX@:LAST:WriteBPS    \: %5.1lf (cur)
        GPRINT:wbps at RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:wbps at RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:wbps at RRDIDX@:AVERAGE: \: %5.1lf (avg)\n

[dperfqlen]
        FNPATTERN dperf.(.+).rrd
        TITLE Disk Load
        YAXIS Queue Length
        DEF:qlen at RRDIDX@=@RRDFN@:qlen:AVERAGE
        LINE2:qlen at RRDIDX@#@COLOR@:@RRDPARAM@ Queue Length
        GPRINT:qlen at RRDIDX@:LAST: \: %5.1lf (cur)
        GPRINT:qlen at RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:qlen at RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:qlen at RRDIDX@:AVERAGE: \: %5.1lf (avg)\n

>  
>
> *Regards,*
>
>  
>
> *Neil Simmonds*
>
> *Senior Operations Analyst (Operations Support Group)**
> **Express Gifts Limited*
>
> Express House
>
> ClaytonBusiness Park
>
> Accrington
>
> Lancashire
>
> BB5 5JY
> T: 01254 303092 | E: neil.simmonds at Express-Gifts.co.uk
> <mailto:neil.simmonds at Express-Gifts.co.uk>
>
>  
>
>  
>
> Name & Registered Office: EXPRESS GIFTS LIMITED, 2 GREGORY ST, HYDE,
> CHESHIRE, ENGLAND, SK14 4TH, Company No. 00718151.
>
> Express Gifts Limited is authorised and regulated by the Financial
> Services Authority
>
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-- 
David Baldwin - Senior Systems Administrator (Datacentres + Networks)
Information and Communication Technology Services
Australian Sports Commission          http://ausport.gov.au
Tel 02 62147830 Fax 02 62141830       PO Box 176 Belconnen ACT 2616
david.baldwin at ausport.gov.au          Leverrier Street Bruce ACT 2617


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