Hi Matt,
Yes, there is a way to create a "delta" between successive polls by
InterMapper. Basically, the process works like this:
At the start of each poll, assign a variable (the "old" variable ) with the
reading from the previous poll, then retrieve the current reading from the
device. Subtract the old value from the current reading to create the
difference between the two values. The current value is kept for the next
poll, where it becomes the "old" value and the process continues.
Here's a test probe you can use as a template.
Regards,
Janice Losgar
Dartware, LLC
====== Excerpt from probe file ========
...
<snmp-device-variables>
...
inOctets, ifOutOctets.1, INTEGER, "current value"
oldInOctets, $newInOctets, CALCULATION, "old inOctets"
newInOctets, $inOctets, CALCULATION, "new inOctets"
deltaBytes, $inOctets-$oldInOctets, CALCULATION, ""
osysUpTime, $cursysUpTime, CALCULATION, "old sysuptime"
cursysUpTime, $sysUptime, CALCULATION, "new sysuptime"
deltaTime, $curSysUptime - $osysUpTime, CALCULATION, ""
...
</snmp-device-variables>
...
<snmp-device-display>
\B5\Prototype SNMP Probe\0P\ \U2=http://${deviceaddress}\Go to
the device's web page\P0\
\4\ sysUpTime:\0\ $sysUptimeMinutes \3\minutes (\0\$sysUptime \3\
hundredths of seconds)\p\
\4\Old Octets:\0\ $oldInOctets on Interface=1
\4\Cur Octets:\0\ $inOctets
\4\Delta's:\0\ $deltaBytes / $deltaTime
\4\Rate:\0\ ${eval:($deltaBytes) / $deltaTime * 100}
</snmp-device-display>.
-----Original Message-----
From: [email protected]
[mailto:[EMAIL PROTECTED] On Behalf Of Matt Ward
Sent: Tuesday, October 21, 2008 11:42 AM
To: [email protected]
Subject: [IM-Talk] Intermapper and percent or absolute delta change rate
monitoring.
Hello, I am from the University of Illinois U/C and I am working on a fairly
ambitious CER monitoring program. We currently use Intermapper to monitor
1500
to 1700 devices on campus and I would like to use it to monitor the
Sensatronics U4/U16 devices as well. I am most interested in evaluating the
temperature data for a percent change or a gross delta change, then I can
trigger an alarm that would indicate a possible failed a/c unit.
So, does anyone out there used Intermapper with these units and is anyone
aware
of a method of looking at a change rate versus a go/no go condition or a
rigid
high/low limit?
Thanks Matt
--
Matt Ward
University of Illinois U/C
1304 W. Springfield Ave.
2110 DCL
Urbana, IL 61801
217-333-8156
CITES Network Maintenance
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