DRS
DRS may be referred to as a joint load balancing and failover solution. It enables vCenter to manage host members of the cluster as an aggregate pool of resources.
Once a host is added to a DRS cluster, its resources become part of the cluster. In addition to resource aggregation, administrators are able to use the following features:
Load balancing: DRS analyzes current resource usage for host and resource pools and compares that to the current demand. Based on this, it recommends or performs VM migrations. For example, the cluster on the left-hand side of the following diagram, assuming that all VMs are the same, is unbalanced. DRS may recommend migration or may perform the migration of VMs by itself to host 2 and 3, as shown in the following diagram, so that host resources are used more efficiently:
Power management: If the DPM feature is turned on, DRS compares the current resource usage to the cluster's capacity. If there is excess capacity, DRS places hosts in standby power mode...
