6.5.1

Optional vCenter Server Components
Optional vCenter Server components are packaged and installed with the base product, but might require a
separate license.
Optional vCenter Server features include:
vMotion
A feature that enables you to move running virtual machines from one ESXi
host to another ESXi host without service interruption. It requires licensing
on both the source and target host. vCenter Server centrally coordinates all
vMotion activities.
Storage vMotion
A feature that allows you to move the disks and conguration le of a
running virtual machine from one datastore to another without service
interruption. It requires licensing on the virtual machine's host.
vSphere HA
A feature that enables a cluster with High Availability. If a host fails, all
virtual machines that were running on the host are promptly restarted on
dierent hosts in the same cluster.
When you enable the cluster for vSphere HA, you specify the number of
hosts you want to be able to recover. If you specify the number of host
failures allowed as 1, vSphere HA maintains enough capacity across the
cluster to tolerate the failure of one host. All running virtual machines on
that host can be restarted on remaining hosts. By default, you cannot turn on
a virtual machine if doing so violates required failover capacity. See the
vSphere Availability documentation for more information.
vSphere DRS
A feature that helps improve resource allocation and power consumption
across all hosts and resource pools. vSphere DRS collects resource use
information for all hosts and virtual machines in the cluster and gives
recommendations (or migrates virtual machines) in one of two situations:
n
Initial placement – When you power on a virtual machine in the cluster
for the rst time, DRS either places the virtual machine or makes a
recommendation.
n
Load balancing – DRS aempts to improve resource use across the
cluster by performing automatic migrations of virtual machines
(vMotion) or by providing a recommendation for virtual machine
migrations.
vSphere DRS includes distributed power management (DPM) capabilities.
When DPM is enabled, the system compares cluster-level and host-level
capacity to the demands of virtual machines running in the cluster. Based on
the results of the comparison, DPM recommends (or implements) actions
that can reduce the power consumption of the cluster.
Storage DRS
A feature that enables you to manage multiple datastores as a single compute
resource, called a datastore cluster. A datastore cluster is an aggregation of
multiple datastores into a single logical, load-balanced pool. You can treat
the datastore cluster as a single exible storage resource for resource
management purposes. You can assign a virtual disk to a datastore cluster,
and Storage DRS nds an appropriate datastore for it. The load balancer
vCenter Server and Host Management
20 VMware, Inc.