[rrd-users] Re: Precise Value Graphing Help Needed

[Pavleck, Jeremy D.]

Greetings Kevin,
  Although I can't help you with this issue, we're also using Weblogic
and would love to see the scripts you've written to automate WLShell. 

 Currently, we're polling those stats via SNMPd, but I'd love to have
access to more information provided by WLSHell.

 Jeremy

Jeremy Pavleck
Network Engineer  - Systems Management
IT Networks and Infrastructure 
	
Direct Line: 612-977-5881
Toll Free: 1-888-CAPELLA ext. 5881
Fax: 612-977-5053
E-mail: jeremy.pavleck at capella.edu
	
Capella University
225 South 6th Street, 9th Floor
Minneapolis, MN 55402

www.capella.edu


 

-----Original Message-----
From: rrd-users-bounce at list.ee.ethz.ch
[mailto:rrd-users-bounce at list.ee.ethz.ch] On Behalf Of Kevin Elliott
Sent: Monday, May 08, 2006 3:25 PM
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] Precise Value Graphing Help Needed

Greetings fellow RRDTool users,

I am writing today in an attempt to diagnose why I am unable to properly
visualize exact last data (using GAUGE) in my rrdtool based historic
tracking instead of what appears to be averaging of some sort.

WebLogic JDBC and Thread Pool Counts are the nature of our data. We are
retrieving this information from production WL servers using WLShell, a
java-based "shell" to WebLogic. We are creating an instance of our
custom wlshell script, and using a loop inside to generate data for 5
minute intervals. After data is retrieved, the wlshell script calls a
perl script that uses RRDTool libraries to update the rrd. Since the
connection to the production servers over our VPN seems to vary in
latency all the time, the time it takes to retrieve the data we're
requesting can change, so the 5 minute intervals are more than likely
not exact.

My problem is that we're trying to see exact values at any given point
in time (and atleast for the last 28 hours graph), rather than any sort
of averaging. It is important to us that we know that around 11:05am,
there was a spike of 10 connections, versus some average that says 6.7. 
We are seeing all sorts of decimals, and not whole integers as expected.

Our perl script contains the code to create the RRD, and we're using
something like:

if ( ! -f $rrdfilename ) {
        print "WARN: RRD file ($rrdfilename) not present,
creating...\n";
        @rrdCreateArgs = ($rrdfilename, "-s", int($rrdInterval * 60));
        if (($rrdHeartBeat = int($rrdInterval * 60) *2) < 600) {
                $rrdHeartBeat = 600;
        }
        foreach $iterator (0 .. $#FIELDS) {
                push @rrdCreateArgs, "DS:" . $FIELDS[$iterator] . 
":$rrdDSType:300:-1:$rrdDSTypeMaxVal";
        }
        push @rrdCreateArgs, "RRA:LAST:0.5:1:800";
        push @rrdCreateArgs, "RRA:LAST:0.5:12:800";
        push @rrdCreateArgs, "RRA:LAST:0.5:264:800";

print "Creating RRDfile \"$rrdfilename\" with create string = |" . 
join('\n', at rrdCreateArgs) . "|\n";

        RRDs::create(@rrdCreateArgs);
        my $error = RRDs::error();
        if ($error) {
                die "ERROR: Cannot create RRDfile \"$rrdfilename\",
error = $error\n";
        }
}


Our step size is 300. Instead of seeing values of 1 on the rrdgraph, 
we're seeing 0.2, and 0.6, etc. Some values do seem to have a plot of 2,

but only because they are consistently at the value of 2, and don't vary

as often. All datasources are type GAUGE.

Are there any recommendations for plotting unaveraged precise 
at-the-moment data? I just want to plot values at 5 minute intervals 
that go up and down per interval. We seem to have exhausted the 
documentation, and have search the web for similar strategies. I think 
we're still not grasping the proper way to do this.

Sincerest Regards,

Kevin

Kevin Elliott
DHAP Digital, Inc



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