Virtualization and its Types

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Virtualization and its Types
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Table of Contents

• Virtualization
• Virtual Machine
• Virtual Machines Key Properties
• Key Features of Virtualization
• Benefits of Virtualization
• Types of Virtualization

• Operating System Virtualization (Virtual
  Machines)
• Application Virtualization and Application-server
  Virtualization
• Network Virtualization
• Storage Virtualization and Hardware
  Virtualization
• Administrative Virtualization

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Virtualization

• Virtualization refers to the process that results
  in the creation of virtual versions of
  applications, servers, networks and storage. It
  is an effective way to cut down on expenses as
  well as enhance efficiency.
• Servers bring to mind web servers. Let us
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  and stores the files of websites, as well as
  delivers those over the Internet, for the purpose
  of making websites accessible. The Best Linux
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  Hosting, the Best Linux Dedicated Hosting are
  certain terms that refer to various types of web
  hosting services.

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Virtual Machine

• VM is the abbreviation of a virtual machine. It
  refers to an environment that is virtual and
  works as a virtual computer system. This virtual
  computer system is equipped with its own memory,
  storage, CPU (central processing unit) and
  network interface that exist on a physical
  hardware system. Since each virtual machine is
  entirely independent, many of these can run on a
  single computer at the same time.
• Hypervisor is a software that serves the purpose
  of separating the resources of a virtual machine
  from the hardware. It allocates computing
  resources dynamically to each virtual machine, as
  per requirement.

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Virtual Machines Key Properties

• The main characteristics of virtual machines are
  mentioned below-
• Partitioning- Many operating systems can be run
  on a single machine. System resources are divided
  among virtual machines.
• Isolation- Security isolation is provided at the
  hardware level. Advanced controls for resources
  aid in preserving performance.
• Encapsulation- An entire state of a VM can be
  saved on a file. Moving and copying virtual
  machines become easy.
• Hardware Independence- Any virtual machine can be
  migrated to any physical server.

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Key Features of Virtualization

• Virtualization aids in delivering the following-
• Multiple applications on a server- Many
  applications as well as operating systems can be
  run on a physical server simultaneously.
• Servers maximum utilization and reduction in
  costs- There is a substantial reduction in costs
  as the full capacity of every physical machine is
  utilized, which ensures the deployment of fewer
  servers in totality.
• Faster and easier resource provisioning- Virtual
  machines deliver speed and flexibility to IT
  resources provisioning and management. Live
  migration is made possible, wherein a virtual
  machine that is running, can be transferred from
  one server to another. It is possible to
  virtualize business-critical apps to ensure
  enhanced performance, scalability and reliability
  while cutting down on costs.

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Benefits of Virtualization

• Virtualization offers numerous benefits. These
  are mentioned below, in no particular order.
• Enhanced speed, flexibility and scalability
• Cost savings (reduced capital costs and operating
  costs)
• Downtime reduction or elimination
• Enhanced workload mobility
• Greater productivity, responsiveness and
  efficiency of IT resources
• Faster provisioning of resources and applications
• Increased availability of resources
• Automated operations
• Disaster recovery
• Simplified data center management

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Types of Virtualization

• The seven main types of virtualization are
  operating system virtualization (VMs),
  application virtualization, application-server
  virtualization, network virtualization, storage
  virtualization, hardware virtualization and
  administrative virtualization. Each of these
  types is discussed in more detail in the
  following slides.

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Operating System Virtualization (Virtual
Machines)

• As the most common type of virtualization, it
  involves virtualizing an operating systems
  environment. This is accomplished by using an
  operating systems second instance or multiple
  instances on a machine. It helps organizations by
  letting them cut down on the amount of hardware
  that is required to run their software.

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Application Virtualization and
Application-server Virtualization

• Application Virtualization
• In this type of virtualization, applications
  operate on computers in a way where these seem to
  be on the hard drive but are being run on a
  server.
• Application-server Virtualization
• Application-server Virtualization spreads
  applications across servers to balance a specific
  softwares workload. It is known as advanced
  load balancing. Apart from carrying out load
  balancing, it renders management of applications
  and servers easy and ensures enhanced network
  security.

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Network Virtualization

• This type of virtualization involves managing IPs
  (Internet Protocol) virtually. Tools such as
  NICs, routing tables, VLAN tags and switches make
  it possible.

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Storage Virtualization and Hardware
Virtualization

• Storage virtualization
• It refers to servers which are managed by a
  storage system that is virtual.
• Hardware Virtualization
• This is a rare type of virtualization, which is
  quite similar to operating system virtualization.
  Moreover, it is frequently needed for OS
  virtualization. In it, parts of a machine are
  partitioned for the purpose of carrying out
  specific tasks.

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Administrative Virtualization

• Administrative virtualization is mainly used in
  data centers. It is probably a lesser-known form
  of virtualization. It involves admin roles that
  are segmented with the aid of group and user
  policies.

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