Virtualization uses software to simulate hardware and allows multiple independent computer systems to run on a single physical computer. This enables consolidating servers - for example, running 12 servers virtually on 2 physical computers with each handling 6 virtual machines. Early examples include DOS running virtually in Windows and virtual machines in Windows NT/2000/XP. Virtualization provides hardware emulation through a virtual machine monitor to isolate guest operating systems running on virtual machines. Benefits include server consolidation, improved utilization, reduced costs and improved flexibility.

1. Virtualisation

3. Virtualisation
 The basic idea behind virtualisation is to use software to simulate
the existence of hardware.
 This enables the running of more than one independent
computer system on a single physical computer system.
 You could have, for example, 12 servers on separate computers
or use virtualisation to run the 12 servers on just 2 computers
say.
 Each computer would then simulate 6 separate computer
systems (6 sets of hardware, each set called a Virtual Machine
VM) on one physical machine.
 Each VM would run its own copy of Win Server 2008

4. Early examples of Virtual Machines
 Virtual Real Mode: DOS runs as a virtual
Machine
 Virtual machines in Win 9x
 Virtual machines in Win NT/2000/XP

9. Operating Systems in Virtual Machines

10. 3 Applications running in a Virtualised Computer (VMM
or hypervisor provides hardware emulation to VMs

11. Server Consolidation

12. Using Virtualisation

13. Virtual Machine Monitor

15. VMM Types
 The following three slides show the three
VMM types
 Host OS
 Hypervisor
 Service OS

16. Host OS (OS Virtualisation)

20. Install Hyper-V Role in Win 2008 Server
 Need 64 bit processor
 Need NIC for physical server and one for
each of the virtual servers
 Aims:
 Server Consolidation
 Improved Server Utilisation
 Reduced Power Consumption
 Reduced data center footprint (Room size)
 Improved flexibility

21. Hyper-V
 Hyper-V installs a hypervisor on top of your
hardware, but beneath the virtualised
systems (VMs).
 Hypervisor makes each VM appear to run
directly on the hardware and not sharing it
with other VMs.
 The one parent system (Server 2008)
maintains this system.