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Creating an Optimization Scenario
The Scenario Planning page enables you to create an optimization scenario. On the Detailed View page, select one or more Groups for optimization and click New Optimization Scenario.
During optimization analysis:
- If you select more than one Group for optimization, then the optimization process will consider all the selections together.
- You can migrate any VM from one host to another. If you do not want the VM to be migrated, then you have to apply the appropriate constraints in the Edit Constraints tab.
The CPU, memory, and storage graphs visible on the Scenario Planning display:
- The capacity demand.
- The subscribed capacity.
- The actual capacity.
If the capacity of a resource fails to meet the demand, then the optimization analysis may fail. In this case, you need to add more capacity to the resources. Similarly, if the capacity subscribed to a resource is more that the allocated capacity, then you need to lower the subscription of the resources or increase the allocated capacity.
The Forecast graph displays the number of VMs that will reach their maximum capacity after 30, 60, and 90 days.
Note: The values of the graphs will change as you modify the optimization scenario.
The optimization analysis takes time to complete. This time is dependent on the volume of data passed for optimization analysis.
To create an optimization scenario:
- Define the scenario name and description. It is mandatory to define a scenario name before initializing the optimization analysis.
- You can modify the workload count, Datastore count, and capacity to be considered for the optimization analysis. Additionally, you can define the constraints affecting the optimization analysis.
- Click Edit Workloads to modify the number of workloads. For more information, see Modifying Workloads.
- Click Edit VM Hosts to modify the capacity. For more information, see Modifying Capacity.
- Click Edit Datastores to modify the number of Datastores. For more information, see Modifying Datastores.
- Click Edit Constraints to define constraints. For more information, see Defining Constraints.
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In the General section, define the following options:
Analysis Period:
Define the time period for which the data is to be considered for optimization analysis. By default, the entire time period for which the data is available is considered for analysis.
Shift Name:
Select the duration for which the data is to be considered for optimization analysis. The default shift hours are defined in the Administration Console.
Click View List to view the list of workloads that have insufficient data.
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In the Placement Options section, define the following options:
Fixed VM Placement:
Select this option if you want to retain the current VM placement.
This option is useful if you want to consolidate just the vDisks.
Use SPECint for CPU Normalization:
Select this option if you want to normalize the CPU capacity and demand across different server models using the SPECint2006 Rate benchmarks incorporated in the product. For more information, see CPU Normalization Using SPECint.
SHO defines a reference host system with a standard configuration. Before running the optimization scenario, SHO expresses the CPU speed of all the VM hosts and CPU usage in GHz of all the VMs in terms of the CPU performance of the reference host. This process is called CPU normalization. The CPU speeds of servers are normalized by using the SPECint2006 Rate CPU numbers of the servers relative to the SPECint2006 Rate number of the reference host system.
Storage Optimization:
By default, SHO considers storage data for optimization. Deselect this option if you do not want storage topology to be considered for optimization. If you deselect this option, the Datastore graph will be removed from the Optimization Scenario page. Additionally, the Storage Subscription option and Storage Constraints will be disabled.
Fixed vDisk Placement:
Select this option if you want to retain the current vDisk placement.
This option is useful if you want to consolidate just the VMs.
Note: This option will be deactivated if you do not want storage data to be considered during optimization.
Place Workloads Based On:
Select the VM placement method from the drop-down list.
Note: If you select VM placement based on the configured capacity of the VMs, SHO does not consider any headroom during optimization analysis.
For a VM, if the time for which the data is available is less than the specified threshold percentage of the defined analysis period, SHO ignores resource usage data and does VM placement based on the configured capacity. A pop-up window appears with the names of such VMs when you open the Optimization Scenario page. The threshold percentage of the analysis period is defined on the Thresholds tab of the Configurations View page. For more information, see Defining Thresholds.
Workloads Considered for Placement:
Select the type of workloads you want to be considered for optimization analysis.
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In the Workload section, define the following options:
Recommended VM Size:
Select whether the VM size should be recommended based on headroom or days required by the VM to reach its threshold.
If you select the Headroom option, define the CPU and Memory headroom.
Headroom is the extra capacity that is made available on the VM so that, in case of an overload, there is always extra capacity to avoid complete breakdown of resources.
ahIf you select the Days to Threshold option, define the number of days.
Note: The CPU and memory headroom defined for a particular Group as a constraint overrides the headroom defined on this page.
If you do not select this option, SHO performs VM placement based on the current VM size.
- In the VM Hosts section, define the CPU and Memory subscription percentage.
Subscription of resources is the percentage of capacity allocated to a VM out of the total capacity reserved for the VM.
- In the Storage section, define the percentage of Datastore subscription to be allocated in the Storage Subscription field.
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Click Optimize. The optimization analysis begins and SHO the Scenario Manager view.
Note: Click Discard Scenario to discard the optimization scenario and return to the Inventory page.
The results for the optimization analysis are displayed on the Result Summary page. For more information, see Viewing Results.
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