What is virtualization?
virtualization is a broad term that
refers to the abstraction of computer
resources in order to work with the
computer’s complexity in a more user
friendly way.
Why Virtualization?
•
Virtualization software lets a single computer run several copies of operating
systems at the same time machine. This turns a single machine into a number of
different computers thus increasing hardware utilization and the flexibility of the
system. Virtualization is changing the way corporations and home users use their
computers.
Background on Virtualization
•
Different Kinds of Virtualization
–
–
–
–
–
–
Server Virtualization
Operating System Virtualization
Application Virtualization
Storage Virtualization
Data/Database Virtualization
Network Virtualization
Positives of Virtualization
•
Increased efficiency
–
–
–
•
Improved security and data recovery
–
–
•
A main focus of Virtualization is the ability for groups (mainly businesses) to be more efficient
Virtualization is, perhaps, the most effective tool for increased efficiency in many large group
scenarios
Instead of dealing with large, manual hardware issues, a problem can be dealt with remotely
Multiple servers = more difficult to hack
Because the servers are not as hardware reliant, a lost file can be restored by the use of a different
hardware
Decreased long-term costs
–
–
Ultimately virtualization will decrease the need for hardware replacement and maintenance
Decreased costs in maintenance and hardware overall will allow businesses to focus funds on other
initiatives
Negatives of Virtualization
• Short-term Cost
–
–
–
–
New infrastructure
Time to configure
Requires special skills
These factors limit scope and timing of initiative, but a solution can usually be
found
• Lack of Redundancy
– Failure of one piece of hardware will influence others
– Backup systems are necessary, but usually easy to put in place
• Increased Overhead
– Insertion of software layers between resources affects processor cycles
– Can range from 2 or 3% to 20 or 30%
– Inherent increased efficiency can more than make up for this problem
Final Opinion
The benefits of virtualization are significant and compelling. The
negatives can be neglible if the system is set up properly. So, with
careful consideration of timing, methods and configuration,
virtualization can be beneficial to almost any IT system.
To ensure that the benefits outweigh the risks, it is important to plan
the project with its goals and environment in mind. It should be timed
in such a way that initial costs can be absorbed. Backup systems are
necessary, but these can be simplified due to the isolation inherent in
virtual systems. With careful planning, however, virtualization is
nearly universally good.