Virtualization.
                     VIRTUALIZATION
INTRODUCTION
• Virtualization is the process of running a virtual instance of a computer system in a 
layer abstracted from the actual hardware. Most commonly, it refers to running 
multiple operating systems on a computer system simultaneously. 
Source: opensource.com
BENEFITS OF 
VIRTUALIZATION
Resource efficiency
• Before virtualization, each application server required its own dedicated physical CPU
—IT staff would purchase and configure a separate server for each application they 
wanted to run. 
Source: www.ibm.com
Easier management
• Replacing physical computers with software-defined VMs makes it easier to use and 
manage policies written in software. This allows you to create automated IT service 
management workflows. 
Source: www.ibm.com
Minimal downtime
• OS and application crashes can cause downtime and disrupt user productivity. 
Admins can run multiple redundant virtual machines alongside each other and 
failover between them when problems arise.
Source: www.ibm.com
Faster provisioning
• Buying, installing, and configuring hardware for each application is time-consuming. 
Provided that the hardware is already in place, provisioning virtual machines to run all 
your applications is significantly faster.
Source: www.ibm.com
TYPES OF 
VIRTUALIZATION
Desktop virtualization
• Desktop virtualization lets you run multiple desktop operating systems, each in its 
own VM on the same computer. There are two types of desktop virtualization:
– Virtual desktop infrastructure (VDI) runs multiple desktops in VMs on a central server and streams them to 
users who log in on thin client devices.
– Local desktop virtualization runs a hypervisor on a local computer, enabling the user to run one or more 
additional OSs on that computer and switch from one OS to another as needed without changing anything 
about the primary OS.
Source: www.ibm.com
Network virtualization
• Network virtualization uses software to create a “view” of the network that an administrator can 
use to manage the network from a single console. It abstracts hardware elements and functions.
Source: www.ibm.com
Storage virtualization
• Storage virtualization enables all the storage devices on the network— whether they’re installed 
on individual servers or standalone storage units—to be accessed and managed as a single 
storage device. 
Source: www.ibm.com
Data virtualization
• Data virtualization tools create a software layer between the applications accessing the data and 
the systems storing it. The layer translates an application’s data request or query as needed and 
returns results that can span multiple systems.
Source: www.ibm.com