Elastic DRS uses an algorithm to maintain an optimal number of provisioned hosts to keep cluster utilization high while maintaining desired CPU, memory, and storage performance.
Elastic DRS monitors the current demand on your SDDC and applies an algorithm to make recommendations to either scale-in or scale-out the cluster. A decision engine responds to a scale-out recommendation by provisioning a new host into the cluster. It responds to a scale-in recommendation by removing the least-utilized host from the cluster.
You cannot disable Elastic DRS in VMware Cloud on AWS. VMware has pre-configured Elastic DRS thresholds across all available policies to ensure SDDC availability. One of the Elastic DRS policies listed in Manage Elasticity in SDDC Clusters is always active.
Elastic DRS is not supported for single host starter SDDCS. Elastic DRS requires at least three hosts in a single-AZ SDDC and six hosts in a multi-AZ SDDC.
When the Elastic DRS algorithm initiates a scale-out, all Organization users receive a notification in the VMC Console and through email.