[Xymon] Graphs of disk usage and active node on Windows cluster

[David Baldwin]

I have a Windows cluster that hosts various file shares on cluster 
disks. I realized today that I can report on usage of the cluster disk 
and the node it is running on in a single graph. In my case it works 
because I have 2 nodes in the cluster, and a graph has 4 lines so a 
given graph has 2 x 2 disk lines appearing on it.

So I have the cluster IP and the 2 nodes in my hosts.cfg file. I then 
went into the cluster directory in the RRD storage area and created some 
symlinks. Due to the FNPATTERN matching of the [disk] graph I then see 
[disk] graphs in my trends report for the cluster. A given daily graph 
may only show one colour, but by clicking on the graph, the longer 
timescales show the data lines from each node as the resource moves 
between them over time.

[disk]
         FNPATTERN disk(.*).rrd
         TITLE Disk Utilization
         YAXIS % Full
         DEF:p at RRDIDX@=@RRDFN@:pct:AVERAGE
         LINE2:p at RRDIDX@#@COLOR@:@RRDPARAM@
         -u 100
         -l 0
         GPRINT:p at RRDIDX@:LAST: \: %5.1lf (cur)
         GPRINT:p at RRDIDX@:MAX: \: %5.1lf (max)
         GPRINT:p at RRDIDX@:MIN: \: %5.1lf (min)
         GPRINT:p at RRDIDX@:AVERAGE: \: %5.1lf (avg)\n

So my symlink hack was just this:

% cd <RRDpath>/fs1clusv.ausport.gov.au
% for d in M N O Q R S ; do for h in 1 2 ; do ln -s 
../fs1n${h}sv.ausport.gov.au/disk,${d}.rrd disk,${d},fs1n${h}sv.rrd; 
done; done

If you had more nodes in your cluster you could create extra dummy files 
to make it up to 4 graphs for 1 drive, or tweak the number of graphs 
that appear on a graph, maybe with a custom graph definition.

This trick could be used for other similar HA scenarios - e.g. load 
balancer, etc.

Sample graphs below.

monthly graph
monthly graph

David.

-- 
David Baldwin - Senior Systems Administrator (Datacentres + Networks)
Information and Communication Technology Services
Australian Sports Commissionhttp://ausport.gov.au
Tel 02 62147830 Fax 02 62141830       PO Box 176 Belconnen ACT 2616
david.baldwin at ausport.gov.au           1 Leverrier Street Bruce ACT 2617
Our Values: RESPECT + INTEGRITY + TEAMWORK + EXCELLENCE


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