Managing DRS Clusters

The vSphere Client UI allows you to explore DRS cluster behavior, which is also described in the

Resource Management Guide

. When DRS is running, it generates recommendations and associated information that result in a well balanced cluster.

Initial placement of virtual machines

Virtual machine migration for load balancing. Each migration recommendation has a rating, which you can find in the

ClusterRecommendation.rating

property. Client applications can choose to consider only high-priority migrations are considered or migrations with multiple priority levels.

Checks whether DRS clusters are valid — enough resources are available to start additional virtual machines — or not valid.

DRS recommendations are stored in the

ClusterComputeResource.recommendation

property, which is an array of

ClusterRecommendation

data objects. Each

ClusterRecommendation

includes information about the action to perform and information you can use to display information to end users or for logging.

Client applications can call

ClusterComputeResource.ApplyRecommendation

to apply one or more recommendations.

For more fine-grained control, client applications can perform individual actions only. The

ClusterRecommendation.action

property is an array of

ClusterAction

objects. Each

ClusterAction

includes a target for the action and the type, which is a string that is one of the values of the

ActionType

enum (

HostPowerV1

MigrationV1

VmPowerV1

). Client applications can use the

ActionType

information to act on DRS recommendations by powering on hosts, migrating virtual machines, or powering on virtual machines by calling

Datacenter.PowerOnMultiVM_Task

VMware vSphere SDKs and Tools 6.5