What does Interval, Sample and QoS Interval mean in the CDM configuration window?

Document ID : KB000039405
Last Modified Date : 14/02/2018
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Question: 

How does CDM Setup-> Control Properties work?

Environment:  

CDM probe

Answer: 

This example is for CPU properties

cdm1.png

 

Interval, means how often the system checks for data.
Samples, means how many data points are averaged on a rolling basis.
Qos Interval, means how often the qos data actually gets written to the database.

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In this example, Interval is 5 minutes, Samples is 5, and QoS interval is 2.
Data is written every 10 minutes (Interval x QoS Interval) into the database. 
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How QoS gets written to the database.

ie. CPU properties:  interval 5 min, samples 5, QoS Interval 1.

#    time      cpu sample     (how number is calculated) 

a  1:00:00      50%              ( a )
b  1:05:00      51%              ( (a+b)/2 )                    qos to database
c  1:10:00      50%              ( (a+b+c)/3 )
d  1:15:00      50%              ( (a+b+c+4)/4)              qos to database
e  1:20:00      50%              ( (a+b+c+d+e)/5 )
f   1:25:00      75%              ( (b+c+d+e+f)/5 )           qos to database
g  1:30:00      75%              ( (c+d+e+f+g)/5 )
h  1:35:00      50%              ( (d+e+f+g+h)/5 )           qos to database
i   1:40:00      50%              ( (e+f+g+h+i)/5 )
j   1:45:00      51%              ( (f+g+h+i+j)/5 )             qos to database 

Additional Information:

See the CDM documentation on http://docops.ca.com