vSphere infrastructure consists of the following components:
ESXi
Allows multiple operating system to run simultaneously
on a single system.
vCenter server
Monitors and manages the management application of
VMs and copies of ESXi. With a vCenter server, you can create, start,
stop, and migrate VMs across the entire physical data center. vCenter
server is optional, but it is required for advanced management capabilities
such as VMware vMotion, Distributed Resource Scheduling (DRS), and
High Availability (HA).
vCenter server database
Stores all the configuration data about a VMware infrastructure
environment. Dell EMC recommends you to use a production database such
as Microsoft SQL Server or Oracle for the vCenter Server database.
vSphere Web Client
Shares the functionality of the core administrative
interface starting from ESXi 5.1, with the vSphere client. vSphere
client can be launched from Internet Explorer or Mozilla Firefox,
without requiring a specific client installation.
vSphere client
Requires an ESXi host to manage, by directly connecting
to it or through vCenter Server. It can be installed on a system running
a supported Windows OS. vSphere Web Client can replace the vSphere
Client for future releases. The vSphere Web Client enables you to
connect to a vCenter Server system to manage an ESXi host or multiple
hosts through a browser.
Virtual Machine datastore
Stores VM configuration and virtual disk files. The
VM storage can either be internal local storage to the ESXi or external
storage. Multiple ESXi system share VM storage. Advanced features
such as HA and DRS require that the hard disk drive and configuration
files are stored on the external shared storage.
The following figure shows the different components
of vSphere.
Figure 1. vSphere components
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