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

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#### Products

DX Infrastructure Management NIMSOFT PROBES

#### Issue/Introduction

Explanation on how CDM Control properties work.

#### Environment

Any UIM and cdm version

#### Resolution

This example is for CPU properties

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 2.

#    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

"Samples" affects the averaging applied to the measurements used to compare against thresholds. So in your example, you have samples set to 3, interval set to 5 and QOS interval set to 1. Then if your measures were 90 @ 5 minutes, 95 @ 10 minutes and​​ 100 @ 15 minutes, you have 3 QOS values sent at that point with values 90, 95, and 100. By the default settings, ​after you have "samples" number of samples, the probe will start comparing with the thresholds and that first comparison will be (90+95+100)/3 or 95%. If at 20 minutes you have another 100% QOS your next comparison will be (95+100+100)/3 or 98.3%. And if you are still at 100% at 25 minutes in, your next comparison would be (100+100+100)/3 or 100%.

#### Attachments

1558715237973000039405_sktwi1f5rjvs16tq8.png get_app