vSphere HA ensures availability of your virtual machines. If a host fails, vSphere HA restarts the VM on a different host. In a VMware Cloud on AWS SDDC, VMware immediately replaces failed hosts, so you can always count on the full set of resources in your SDDC

Note: For a seamless user experience, the screens for configuring, monitoring, and examining clusters and resource pools are the same in an on-premises SDDC and in a VMware Cloud on AWS SDDC. However, the Edit button is grayed out for VMware Cloud on AWS.


  1. In the vSphere Client, click Menu and select Hosts and Clusters.
  2. Select Cluster-1.
    In VMware Cloud on AWS, a single cluster holds the configuration settings. Because the settings are predefined, a second cluster is not needed.
  3. Examine the vSphere HA settings, which are optimized for a cloud environment.
    Setting Discussion
    vSphere HA is Turned ON With vSphere HA turned on, virtual machines are protected against host failure.
    Proactive HA is Turned OFF Because VMware immediately replaces failed hosts, Proactive HA is not needed in the VMware Cloud on AWS environment.
    Failure conditions and responses Because your VMware Cloud on AWS is protected at the hardware level, some vSphere HA features are disabled. It makes no sense to have these features enabled in the cloud.
    Admission Control Shows reserved CPU and memory capacity. If your cluster does not have the specified failover capacity, you cannot start additional VMs.
    Advanced Options Displays the settings for advanced options that are preset in the cloud SDDC.

    For detailed discussions of vSphere HA and other features that ensure availability in an on-prem vSphere environment, see the vSphere Availability documentation. Many of the features that on-prem administrators have to manage are preset in VMware Cloud on AWS.

  4. Click the vSphere HA Monitoring link for more information on vSphere HA events.