Control how often CDM sends QOS and alarms. Q&A

Products

DX Unified Infrastructure Management (Nimsoft / UIM)

Issue/Introduction

What is the exact meaning of the "Control Properties" values in the CDM probe?
How can I control how often CDM sends QOS and alarms?
How often are alarms sent by the CDM probe and how does it correlate with QOS?
Why even though I set interval at 5 minutes, I don't get an alarm from CDM after 5 minutes after restarting the CDM probe?
How can I send CDM alarms every minute, with a QOS interval of 5 minutes?

Environment

DX UIM 20.4.* / 23.4.*
CDM any version

Cause

Guidance/configuration

Resolution

What is the exact meaning of the "Control Properties" values in the CDM probe?

How can I control how often CDM sends QOS and alarms?

Here we have 3 Values for each Disk, CPU and Memory properties:

There are three concepts here (Interval, Samples and QOS Interval): cdm IM Configuration

Interval: Means how often the system checks for data. In other words, specifies the interval (in minutes) after which the monitoring information is obtained from the system.
When the CDM probe actually queries the system for CPU, DISK or MEMORY. When data is picked up from a system, is not necessarily inserted to the DB yet, but it's kept in memory and is used for threshold comparison and is inserted in the DB only after the QOS interval value is also met.

Samples: Means how many data points are averaged on a rolling basis. The samples specify the number of samples the probe stores. This number is used to calculate values to compare with thresholds to send alarms. The alarms are sent only if it has enough samples.

Qos Interval: (Multiple of 'Interval'): Means how often the QOS data actually gets written to the database. Specifies the monitoring interval between each sample collection for QoS information. For example, If the interval is set to 5 minutes and a number of samples is set to 5, the average CPU utilization for the last 25 minutes is displayed in the QoS message.
If “the value is greater than 1, the probe only calculates the average data for CPU monitoring. For disk, memory, and paging QoS messages, the probe generates the QoS messages with the current value.

How often are alarms sent by the CDM probe and how does it correlate with QOS?

Why even though I set interval at 5 minutes, I don't get an alarm from CDM after 5 minutes after restarting the CDM probe?

The alarm is sent at every "interval" defined.
However, the alarm is sent as long as there are at least "x" samples available in the probe "cached memory".
For example, If you restart the probe, you don't have any samples in the probe cache memory as there are cleared out after restart, and at the same time you have set "5 samples", you will need to wait for the "Interval" time multiplied by the number of samples before getting the first alarm.

After the first alarm you will get an alarm at every interval because it will be using the last "x" samples in memory.

The QOS is sent at every "interval" multiplied by the QOS Interval.

How can I send CDM alarms every minute, with a QOS interval of 5 minutes?

To check alarms every minute, with a QOS interval of 5 minutes set the following options:

Interval: 1 minute. Alams will be sent every minute!

Samples: Here set how many samples you would like the comparison to based on. Regardless of this value the alarm will be sent every minute. As long as there are enough samples since last restart.

QOS interval: 5 minutes