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Foglight Change Analyzer 5.8 - User Guide

Impact Analysis view

To open the Impact Analysis view, click the Impact Analysis icon on the Change Analyzer tab > Menu bar.

For more details, see the following topics:

•
Purpose
•
Description of view elements

Purpose

The Impact Analysis view allows you to define a sequence of changes and see what impact those changes have on your system’s performance. It also allows you to trigger the execution of these changes immediately or schedule these changes within Foglight or Foglight for Virtualization, Enterprise Edition. For detailed information about how the performance impact is calculated, see Performance impact assessment.

Performance impact assessment

This section presents the algorithm used by Foglight Change Analyzer to calculate the performance impact of a modeled change on your system.

Calculate the total available cumulative CPU, Memory, Storage, and Throughput resources (Total Resource). Account for the warning threshold and failover resource requirement. For example, in a 4-host cluster where each host has 8GB of memory, the Memory Warning Threshold is set to 80%, and a single host is reserved for failover, the total available cumulative Memory resource would be 19.2GB (32GB - 8GB * .80).

Calculate the total required cumulative CPU, Memory, Storage, and Throughput resources prior to the change(s) (Current Requirement). This would be the sum of the actual average utilization or resource reservation, whichever is larger, for each powered-on VM currently deployed.

Calculate the total required cumulative CPU, Memory, Storage, and Throughput resources after the change(s) (Change Requirement).

If the Current Requirement is less than the Total Resource, and the Change Requirement is less than the Total Resource, there is no performance impact (for the resource) as a result of the change.

If the Current Requirement is less than the Total Resource, and the Change Requirement is greater than or equal to the Total Resource, performance will be degraded (for the resource) as a result of the change, due to a lack of resource equal to the absolute difference between the Change Requirement and the Total Resource.

If the Current Requirement is greater than or equal to the Total Resource, and the Change Requirement is less than the Total Resource, the current performance impact (for the resource) will be improved as a result of the change, due to a gain in resource equal to the absolute difference between the Current Requirement and the Total Resource.

If the Current Requirement is greater than the Total Resource, the Change Requirement is greater than the Total Resource, the absolute difference between the Current Requirement and the Change Requirement is greater than 5% of the Total Resource, and the Current Requirement is less than the Change Requirement, the current performance will be further degraded (for the resource) as a result of the change, due to a lack of resource equal to the absolute difference between the Current Requirement and the Change Requirement.

If the Current Requirement is greater than the Total Resource, the Change Requirement is greater than the Total Resource, the absolute difference between the Current Requirement and the Change Requirement is greater than 5% of the Total Resource, and the Current Requirement is greater than the Change Requirement, the current performance impact (for the resource) will be reduced but not eliminated as a result of the change, due to a gain of resource equal to the absolute difference between the Current Requirement and the Change Requirement.

In all other cases, there is no performance impact.

Description of view elements

This view is made up of the following elements:

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Impact Analysis—Selectors bar
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Impact Analysis—Toolbar
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Impact Analysis—Quick view
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Impact Analysis—Change History view
Impact Analysis—Selectors bar
 
Table 9. Impact Analysis—Selectors bar
Description

This bar allows you to specify the virtual objects for which you want to review the modeled changes.

Data displayed

Filter Object. Allows you to select the VMs for which you want to review, create, or modify modeled changes.

Environment selector. Allows you to select the environment to be analyzed. The following options are available by default in the drop-down list (additional user-created items may appear in the list as well):

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All Objects
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All Clusters
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All Standalone Hosts
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Unassigned

Object selector. Allows you to select the object to be analyzed.

Where to go next

The Impact Analysis—Quick view is updated with information relevant for the for the selected environment.

Impact Analysis—Toolbar
 
Table 10. Impact Analysis—Toolbar
Description

This bar allows you to add, edit, delete and implement modeled changes in a selected environment.

Data displayed

Add Change. Allows you to model a change to the environment.

Edit Change. Allows you to edit a modeled change.

Delete Change. Allows you to delete a modeled change.

Implement Change. Allows you to implement a modeled change to the environment.

Where to go next

The Impact Analysis—Quick view is updated with to display the latest information about the modeled changes.

Impact Analysis—Quick view
 
Table 11. Impact Analysis—Quick view
Description

This view displays the changes modeled for a selected virtual environment (in the upper table), detailed information about their impact on the system’s performance (in the middle table), and the change history for the selected virtual environment (in the lower table).

Data displayed

Upper table. Displays all changes modeled for the selected environment.

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Object Name. Shows the name of the virtual object to which the modeled change applies.
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Change Description. Shows a short description of the modeled change.
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Performance Impact. Shows the impact the change has on the system’s performance. For detailed information about how the performance impact is calculated, see Performance impact assessment.

Lower table. Displays detailed information about the modeled change selected in the upper table.

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Virtual Object. Shows the virtual objects affected by the selected modeled change.
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Performance Impact: CPU, Memory, Storage, and Throughput. Shows the impact of the modeled change on the system’s performance.
Where to go next

Drill down on: N/A

Impact Analysis—Change History view
 
Table 12. Impact Analysis—Change History view
Description

This view displays the history of changes implemented using the Impact Analysis functionality.

Data displayed

Target Name. Shows the virtual objects affected by the modeled change.

Change. Shows the type of change. For a list of change events being monitored and reported, see Table 4.

Executed. Shows the date and time when the change was executed.

Created by. Shows the user who created the modeled change.

Description. Shows a description for the modeled change.

Where to go next

Drill down on: N/A

Users and Permissions view

To open the Users and Permissions view, click the Users and Permissions icon on the Change Analyzer tab > Menu bar.

For more details, see the following topics:

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Purpose
•
Description of view elements
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