How it works
DRS, once enabled, will aggregate the resources from the participating ESXi hosts as cluster resources. Its job is to load balance the DRS cluster for better utilization of the cluster resources. It does so by migrating or generating migration recommendations for VMs whenever needed. It also provides initial placement for the VMs. Migration recommendations will be generated by vSphere DRS only when it identifies a resource imbalance in the cluster. A resource imbalance is determined on a per-ESXi-host basis. It does so by considering the resource reservations for all of the VMs on the ESXi host, comparing these against the total capacity of the host, and then checking whether the host can or cannot meet the cumulative resource ...
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