VMware VCENTER SERVER 4.0 - GETTING STARTED UPDATE 1 Specifications Page 17

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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 configuration file 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 goes down, all
virtual machines that were running on the host are promptly restarted on
different 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 usage
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 first power on a virtual machine in the
cluster, DRS either places the virtual machine or makes a recommendation.
n
Load balancing – DRS attempts to improve resource utilization 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 flexible storage resource for resource management
purposes. You can assign a virtual disk to a datastore cluster, and Storage DRS
Chapter 1 vSphere Concepts and Features
VMware, Inc. 17
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