VMware ESX 4.0 - GETTING STARTED UPDATE 1 Instrukcja Użytkownika Pobierz pdf (Strona 16)

Table 1. Comparison of Multiple and Single Host Management (Continued)

Feature vCenter Server ESX

No downtime maintenance Possible with VMotion Not available

Load balancing Possible with VMware DRS Not available

Failover Possible with VMware HA Not available

Power savings Possible with VMware Distributed Power

Management (DPM)

Not available

Centralized access control Available with Active Directory

Integration

Not available

vSphere and vCenter Server

VMware vSphere is a suite of virtualization applications that includes ESX and vCenter Server.

vSphere uses virtualization to do the following tasks:

Run multiple operating systems on a single physical machine simultaneously.

Reclaim idle resources and balance workloads across multiple physical machines.

Work around hardware failures and scheduled maintenance.

vSphere includes the following components in addition to the ESX host and vSphere Client you have already

setup:

VMware vCenter Server

vCenter Server unifies resources from individual hosts so that those resources

can be shared among virtual machines in the entire datacenter. It accomplishes

this by managing the assignment of virtual machines to the hosts and the

assignment of resources to the virtual machines within a given host based on

the policies that the system administrator sets.

vCenter Server allows the use of advanced vSphere features such as VMware

Distributed Resource Scheduler (DRS), VMware High Availability (HA), and

VMware VMotion.

Datacenter

A datacenter is a structure under which you add hosts and their associated

virtual machines to the inventory.

Virtual Machine

A virtual machine is a software computer that, like a physical computer, runs

an operating system and applications. Multiple virtual machines can run on

the same host at the same time. Virtual machines that vCenter Server manages

can also run on a cluster of hosts.

Figure 3 shows the relationships among the basic components of vSphere and how vCenter Server can be used

to manage hosts and run virtual machines.

Getting Started with ESX

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