04-15-2008 10:22 AM
I have a question regarding DFM and how/what it polls when looking at utilization and up/down.
How does DFM calculate over utilization? what is it looking at? how accurate and timely is the information?
with up/down, is it simply the polling that will tell me that a device is down? A syslog message that tells me it is backup?
thanks
04-15-2008 10:28 AM
Are you asking about interface utilization or CPU/Memory?
We poll different MIB objects to get this data, and as soon as you let me know what you want specifically I can let you know.
04-15-2008 10:31 AM
Interface utilization. I am wondering how accurate this info is and what interface value is being monitored? 5min, 30 second???
04-15-2008 10:48 AM
High Utilization
event definition:
CurrentUtilization > UtilizationThreshold;
CurrentUtilization =
((TrafficRate * 8) / MaxSpeed * 100;
TrafficRate =
= ifInOctetsRate + ifOutOctetsRate; if DuplexMode is HALFDUPLEX
= max(ifInOctetsRate, ifOutOctetsRate) if DuplexMode is FULLDUPLEX
ifInOctetsRate =
= rate(ifInOctets, PollingInterval);
ifOutOctetsRate =
= rate(ifOutOctets, PollingInterval);
UtilizationThreshold = 40
simulation:
ifInOctets 1.3.6.1.2.1.2.2.1.10
ifOutOctets 1.3.6.1.2.1.2.2.1.16
or High capacity counter (not supported by all OS versions)
ifHCInOctets 1.3.6.1.2.1.31.1.1.1.6
ifHCOutOctets 1.3.6.1.2.1.31.1.1.1.10
To simulate high utilization, use the following value:
MaxSpeed/8 * 0.5
You can find MaxSpeed from Interface/Port property sheet.
The counters will wrap after sometime. Please make sure the rate
calculation is right when counters wrap.
expected: PerformanceException
-- HighUtilization
04-15-2008 10:49 AM
The time depends on our polling intervals configured in DFM (pollings and thresholds configuration)
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