Installation guide

To have a single namespace (that is, a single datacenter) for all networks and
datastores, use folders within the datacenter to organize the networks and
datastores. To have separate namespaces (separate datacenters) for networks
and datastores, create two datacenters.
Datastores
A virtual representation of combinations of underlying physical storage
resources in the datacenter. A datastore is the storage location for virtual
machine files. These physical storage resources can come from the local SCSI
disk of the server, the Fibre Channel SAN disk arrays, the iSCSI SAN disk
arrays, or Network Attached Storage (NAS) arrays. Datastores hide the
idiosyncrasies of the storage options and provide a uniform model for various
storage products required by virtual machines.
Folders
A top-level structure for vCenter Server only. Folders allow you to group
objects of the same type so you can easily manage them. For example, you can
use folders to set permissions across objects, to set alarms across objects, and
to organize objects in a meaningful way.
A folder can contain other folders, or a group of objects of the same type:
datacenters, clusters, datastores, networks, virtual machines, templates, or
hosts. For example, one folder can contain hosts and a folder containing hosts,
but it cannot contain hosts and a folder containing virtual machines.
The datacenter folders form a hierarchy directly under the root vCenter Server
and allow users to group their datacenters in any convenient way. Within each
datacenter is one hierarchy of folders with virtual machines and templates, one
with hosts and clusters, one with datastores, and one with networks.
Hosts
The physical computer on which the virtualization platform software, such as
ESX/ESXi, is installed and all virtual machines reside. If the vSphere Client is
connected directly to an ESX/ESXi host, only that host is available for
management.
NOTE When vCenter Server refers to a host, this means the physical machine
on which the virtual machines are running. All virtual machines within the
VMware vSphere environment are physically on ESX/ESXi hosts. The term host
in this Help system refers to the ESX/ESXi host that has virtual machines on it.
Networks
A set of virtual network interface cards (virtual NIC), virtual switches
(vSwitch), and port groups that connect virtual machines to each other or to
the physical network outside of the virtual datacenter. All virtual machines that
connect to the same port group belong to the same network in the virtual
environment, even if they are on different physical servers. You can monitor
networks and set permissions and alarms on port groups.
Resource pools
A structure that allows delegation of control over the resources of a host.
Resource pools are used to compartmentalize all resources in a cluster. You can
create multiple resource pools as direct children of a host or cluster and
configure them. Then delegate control over them to other individuals or
organizations. The managed resources are CPU and memory from a host or
cluster. Virtual machines execute in, and draw their resources from, resource
pools.
vCenter Server provides, through the DRS components, various options in
monitoring the status of the resources and adjusting or suggesting adjustments
to the virtual machines using the resources. You can monitor resources and set
alarms on them.
vSphere Basic System Administration
20 VMware, Inc.