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- A computer near us
- Many users realize computers with only this application
- We have almost full control over it
- It works occassionally
- Its failure does not bear serious consequences
- We can easily replace it with another workstation or with a tablet or a smartphone
Server
- A computer which we usually operate by remote access
- Many users do not realize its presence at all
- Only special professionals have full control over it
- It works continually
- Its failure affects many users and their tasks
- Its replacement is a complex task
Workstation vs Servers
A workstation is equipped with intuitive, user-friendly system with the GUI
A server is supplied with a system optimized for resources management purposes, especially non-interactive (without presence of a human user); typical
Virtualization
- It is a technique to emulate the new independent computer as a process of another computer
- The computer which executes a virtualization software is called a host
- The emulated computer is called a guest
- The host can emulate many guests
- All resources of the guest are mapped to corresponding resources of the host
Modern implementations of virtualization software cause only small decrease of performance
However, we can remember that resources such as CPU or memory are SHARED between a host and all guests
Virtualization maps the guest's RAM to a portion of the host's RAM. Therefore, the host's memory is a natural limit for the number of guests.
The Lab (machines withpout OS)
Let's create simple virtual computers without any operating system instlled using:
- VMWare Player/ VMWare Workstation Playre (http://www.vmware.com) [download VMWare Workstation Player 12]
- Oracle Virtualbox (http://virtualbox.org)
Check the following aspects:
- Switching a focus between a host and a guest
- Mapping a disk of the guest to a file/files of the host
- Turning power on/off a Ctrl+Alt+Del combination on the guest
- Suspeding thee guest
- Emulating inserting and ejecting a CD with the virtual CD-rom drive
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