There are times
where we used to configure multiple physical machines to run servers. Now we
have many options to configure multiple servers in a single physical machine to
provide services. Virtualization provides us the same.
A virtualization is
software that separated physical infrastructures to create various dedicated
resources. This can be treated as a fundamental that powers cloud computing.
in simpler words, Virtualization
software makes it possible to run multiple operating systems and multiple
applications on the same server at the same
The technology
behind virtualization is known as a virtual machine monitor (VMM) or virtual
manager, which separates compute environments from the actual physical
infrastructure.
A Virtual machine
is nothing but a encapsulated Operating System which can run applications as a
physical machine. The physical machine contains a program (called Hypervisor)
to manage the one or more Virtual machines running (called Domains).
Virtualization
makes servers, workstations, storage and other systems independent of the
physical hardware layer
There are 2 types
of Virtualizations available
Para Virtualization
Full Virtualization
- Uses modified
Kernel Uses
OS Kernel(Unmodified)
- Cannot run
windows Can
run windows
- Guest Know that it
is Does
not it is Virtual machine Virtual Machine and talk To Hypervisor
In Para
Virtualization, when a new Guest Operating system is installed, the kernel of
that is modified such that the Guest knows that it is a Virtual machine and it
should talk to Hypervisor for any requirements like processing, ram e.t.c.
Some of the
advantages of Virtualization are,
Maximize resources
– virtualization can reduce the number of physical systems we need and will
give more value the underlying resources.
Multiple Systems –
With Virtualization, you can also run multiple types of applications and even
run different Operating systems for those applications on the same physical
Hardware.
Budget - When you
use virtualization, management, administration and all the attendant
requirements of managing your own infrastructure remain a direct cost of your
IT operation.
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