Recalculating the spare VM basis

The Capacity page of the vSphere Infrastructure view provides an estimate of the additional VMs that can be added to a cluster based on a typical VM configuration. Using this estimate, you can identify the clusters with residual or spare capacity. You can customize this typical VM configuration and review the changed estimate of additional VMs that can be added to the cluster.

 

Related topics

vSphere-views

vSphere-Infrastructure-view

Clusters-page-in-the-vSphere-Infrastructure-view

To recalculate the spare VM basis

  1. Access the vSphere Infrastructure view and ensure that the Clusters > Capacity page is open.
  2. In the Spare VM basis column of the table, click TYPICAL or CUSTOM. The details of the spare VM basis are displayed in a new window.
    sparevm_1.png
  3. Click Change. The following options are displayed: TYPICAL and CUSTOM.
  4. Specify the spare VM basis:
    1. To use the calculation that is provided by default, select TYPICAL. The typical spare VM basis is computed by using the average utilization of the VMs for the time period that is selected in the time filter of the page. For more information, see Indicators.
    2. To use specific VM attributes to compute the number of spare VMs, select CUSTOM and type values for the following attributes and select their corresponding measurement units:
      1. CPU Utilization
      2. Memory Utilization
      3. Disk Utilization
        sparevm_2.png
  5. Click Apply.
    Depending on the option that you selected, the spare VM basis settings are saved and applied for the selected cluster. 
  6. Click x to close the window.

The table in the Capacity page displays the modified number of spare VMs based on the updated settings in the Spare VMs column.

Spare VM calculation

Spare VMs are computed by using the resource consumption of an average VM in the cluster. Average VM can be a typical VM in the cluster or a custom VM.

The following table lists formulas for spare VM calculation.

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