Chapter 1 Virtualization Wrapping your head around virtualization ( Why…
Chapter 1 Virtualization
Wrapping your head around virtualization
2.Sorting out the types of virtualization
Companies use centralized storage as a way of avoiding data access problems.
A bottleneck can be create because multiple machines that need to access the same data.
Many applications generate more data than can be stored physically on a singles server.
Paravirtualization requires that the guest operating systems be modified in order to interact with the paravirtualization interfaces.
Paravirtualization does not limit you to the device drivers contained in the virtualization software
paravirtualization thin software layer acts more like a traffic cop, allowing one guest OS access to the physical resources of the hardware while stopping all other guest OSs from accessing the same resources at the same time.
Hardware emulation is also used in server consolidation, where a number of operating system/application environments are moved from separate physical servers to a single physical server running virtualization software.
Virtualization software presents an emulated hardware environment that guest operating systems operate upon.
Operating system virtualization
Containerization usually means that the containers offer the same operating system as the host OS and even be consistent in terms of version number and patch level.
Runs on top of an existing host operating system and provides a set of libraries that applications interact with, giving an application the illusion that it is running on a machine dedicated to its use.
Why virtualization is Hot
Trend #4 System administration cost munt
Virtualization can reduce system administration requirements drastically, making virtualization an excellent option to address the increasing cost of operations personnel.
Trend #3 Green initiatives demand better energy efficiency
virtualization ability to reduce the total number of physical servers can significantly reduce the overall cost of energy for companies.
Trend #2 Data centers sun out of space
Virtualization, by offering the ability to host multiple guest systems on a single physical server, allows organizations to reclaim data center territory, thereby avoiding the expense of building out more data center space.
Trend #1 Underutilized Hardware
virtualization do it, by enabling a single piece of hardware to seamlessly support multiple systems.
There ought to be a better way to match computing capacity with load