Auto Scaling Group Optimization [Cloud Optimization]

#371890

The policy settings in this group are related to optimizing auto scaling groups.

Minimum Scale Group Size

Table: Minimum Scale Group Size

Description	This setting defines the minimum allowed number of EC2 instances to be recommended for an ASG.
Use Case
Values/Units	An integer indicating the minimum scale group size.
Dependencies
Example

- Maximum Increase Advanced Setting

Table: - Maximum Increase

Description	This setting defines the maximum allowed increase percentage for the recommended minimum group size, based on the existing minimum group size.
Use Case
Values/Units	Percentage of the existing minimum group size.
Dependencies
Example

- Maximum Decrease Advanced Setting

Table: - Maximum Increase

Description	This setting defines the maximum allowed decrease percentage for the recommended minimum group size, based on the existing minimum group size.
Use Case
Values/Units	Percentage of the existing minimum group size.
Dependencies	This setting cannot result in the group falling below the "Minimum Scale Group Size".
Example

Maximum Scale Group Size

Table: - Maximum Scale Group Size

Description	This setting defines the maximum allowed number of EC2 instances to recommend for an ASG.
Use Case
Values/Units	An integer indicating the maximum group size.
Dependencies
Example

- Headroom for Maximum Group Size Advanced Setting

Table: - Headroom for Maximum Group Size

Description	This setting defines the maximum group size increase percentage to recommend, on top of the existing maximum group size.
Use Case
Values/Units	Percentage of the "Maximum Scale Group Size" value.
Dependencies
Example

- Maximum Increase Advanced Setting

Table: - Maximum Increase

Description	This setting defines the maximum allowed increase percentage for the recommended maximum group size, based on the existing maximum group size.
Use Case
Values/Units	Percentage of the existing maximum group size.
Dependencies
Example

- Maximum Decrease Advanced Setting

Table: - Maximum Increase

Description	This setting defines the maximum allowed decrease percentage for the recommended maximum group size, based on the existing maximum group size.
Use Case
Values/Units	Percentage of the existing maximum group size.
Dependencies
Example

Sizing Strategy

Table: Sizing Strategy

Description	This setting defines the strategy to use when sizing EC2 or VM instances, within an ASG or VM Scale Set. For "CPU and Memory" and "CPU only" options, the settings, listed below, indicated as "Custom..." are pre-defined in the extension. You can select "Custom" and then use the settings below to change the predefined values.
Use Case
Values/Units	Select "CPU and Memory", "CPU Only", or "Custom".
Dependencies	If "CPU and Memory"' or "CPU Only" is selected, the corresponding limits are based on the"'Sizing Limit" setting below and the corresponding scoring strategy is based on the "Sizing Strategy" below. If "Custom" is selected, then the advanced settings below, are used.
Example

- Custom Sizing Input Workloads Advanced Setting

You can overide some of these policy settings. Overrides are independent of the "Sizing Strategy" pick list; i.e. regardless of the value selected here the override, if provided will be applied when the analyses are run. See Scale Group Overrides for details of options and for configuring overrides.

Table: - Custom Sizing Input Workloads

Description	This setting defines the workload types to use for determining the optimal instance type for an ASG or VM Scale Set. This setting is used when "Custom" is selected for "Sizing Strategy".
Use Case
Values/Units	A colon-separated list of workload types.
Dependencies
Example	CPU_CINT2006Rate_Utilization;Raw_Mem_Utilization

- Custom Sizing Output Workloads Advanced Setting

Table: - Custom Sizing Output Workloads

Description	This setting defines the workload types to use for displaying recommendation workload charts. This setting is used when "Custom" is selected for "Sizing Strategy".
Use Case
Values/Units	A colon-separated list of workload types.
Dependencies
Example	CPU_Util_Predicted_Day; Mem_Utilization_As_Pct

- Custom Sizing Backfill Workloads Advanced Setting

[CRB-53279] When analyzing the list of ASG candidates, Densify uses the representative memory workload: ASG parent (ECS/EKS), busiest child, ASG, and workload days policy setting. If the ASG does not have memory data , the simulation does the following:

The ASG sizing extension uses memory constraints when running the simulation;
Fall back memory that is defined through this policy setting is used;
The simulation accounts for memory even if memory usage data is not available for ASG

Table: - Custom Sizing Backfill Workloads

Description	This setting defines the workload types to use for backfilling resource utilization metrics. This setting is used when "Custom" is selected for "Sizing Strategy".
Use Case
Values/Units	A colon-separated list of workload types.
Dependencies	The specified list of workloads must be the same as those defined for the -Custom Sizing Input Workloads.
Example	Use the Transform_CloudECS tag if available. It is published for ASGs that are children of ECS, otherwise use Mem_Cloud Mem Utilization As Pct, !Mem Cloud

- Custom Sizing Backfill Parent Workloads Advanced Setting

Table: - Custom Sizing Backfill Parent Workloads

Description	This setting defines the workload types to use for backfilling parent resource utilization metrics. This setting is used when "Custom" is selected for "Sizing Strategy".
Use Case
Values/Units	A colon-separated list of workload types.
Dependencies	The specifed list of workloads must be the same as those defined for the -Custom Sizing Input Workloads.
Example	Mem Utilization As Pct, !Transform_CloudECS

- Custom Sizing Scoring Advanced Setting

Table: - Custom Sizing Scoring

Description	This setting defines the scoring strategy to use when sizing EC2 or VM instances, within an ASG or VM Scale Set. This setting is used when "Custom" is selected for "Sizing Strategy".
Use Case
Values/Units	A colon-separated list of scoring strategies.
Dependencies
Example

- Custom Sizing Limits Advanced Setting

Table: - Custom Sizing Limits

Description	This setting defines the scoring limit to use when sizing EC2 or VM instances, within an ASG or VM Scale Set. This setting is used when 'Custom' is selected for 'Sizing Strategy'.
Use Case
Values/Units	A colon-separated list of scoring limits.
Dependencies
Example	70;70

Sizing Limit - Scoring Strategy

Table: Sizing Limit - Scoring Strategy

Description	This setting defines the scoring strategy to use when sizing EC2 or VMs instances, within an ASG or VM Scale Set.
Use Case
Values/Units	Select one of the following scoring strategies: Average Peak Sustained See Scoring Strategy Setting on page 1 for details.
Dependencies	This setting is used when either "CPU and Memory" or "CPU Only" is selected for "Sizing Strategy"
Example	Sustained

CPU Sizing Limit

Table: CPU Sizing Limit

Description	This setting defines the CPU utilization limit to use when sizing EC2 or VM instances, within an ASG or VM Scale Set.
Use Case
Values/Units	A numeric value representing a percentage from 0 to 100.
Dependencies	This setting is used when either "CPU and Memory" or "CPU Only" is selected for "Sizing Strategy".
Example

Memory Sizing Limit

Table: Memory Sizing Limit

Description	This setting defines the memory utilization limit to use when sizing EC2 or VM instances, within an ASG or VM Scale Set.
Use Case
Values/Units	A numeric value representing a percentage from 0 to 100.
Dependencies	This setting is used when "CPU and Memory" is selected for "Sizing Strategy".
Example

Worker Size Limit - Cores

Table: Worker Size Limit - Cores

Description	This setting allows you to limit the increase of vCPU cores for the current size relative to recommended sizing, for ASG worker nodes. The range is typically 25 to 100%, with the higher percentages allowing a smaller increase. i.e. if set to 25%, the recommended worker node can have 4 times more vCPUs than the current worker node. A value of 100% allows no increase in vCPU allocation. This setting is mapped as the low limit to Total CPUs and controls the maximum size of the recommended Instance type.
Use Case	For ASG recommendations it is important to be able to control the maximum instance size in order to avoid using bigger (and more expensive) instances, even though it may appear to be optimal, large instances may introduce issues, if the ASG needs to scale up, rapidly.
Values/Units	Size limit as a percentage. i.e. 25%
Dependencies
Example

Worker Size Limit - Memory

Table: Worker Size Limit - Memory

Description	This setting allows you to limit the increase the memory for the current size relative to recommended sizing, for ASG worker nodes. The range is typically 25 to 100%, with higher percentages allowing a smaller increase. i.e. if set to 25%, the recommended worker node can have 4 times more memory than the current worker node. A value of 100% allows no increase in memory allocation. This setting is mapped as the low limit to Total Memory and controls the maximum size of the recommended Instance type.
Use Case	For ASG recommendations it is important to be able to control the maximum instance size in order to avoid using bigger (and more expensive) instances, even though it may appear to be optimal, large instances may introduce issues, if the ASG needs to scale up, rapidly.
Values/Units	Size limit as a percentage. i.e. 25%
Dependencies
Example