DRS and HA function independently of each other - with HA an agent is loaded on the ESXi hosts that manage the tracking of the VMs that are running on the cluster and the restart of the VMs if a host fails - DRS is managed by vCenter - the resources usage of the ESXi hosts are monitored and when a VM is powered a host is selected to start the VM and while they run the VM resource use is monitored and if it requires more resources the VM is moved with vmotion to a host with sufficient resources
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