Virtualization

1
Week 20

• Virtualization

2
This week

• Virtualization
• What is it?
• Software on different operating systems?
• Group Presentations 10-15 minutes per group

3
What is it?

• ...a technique for hiding the physical
  characteristics of computing resources from the
  way in which other systems, applications, or end
  users interact with those resources. This
  includes making a single physical resource (such
  as a server, an operating system, an application,
  or storage device) appear to function as multiple
  logical resources or it can include making
  multiple physical resources (such as storage
  devices or servers) appear as a single logical
  resource." taken fromMann and Andi (N/A

4
VMWare

• VMware allows multiple operating systems can run
  unmodified and at the same time on a standard PC.
  
• For developers
• run multiple development environments on your
  desktop without rebooting
• isolate and protect operating environments,
  applications and data
• interoperate among operating systems
• For users, VMware makes it possible to run
  Windows applications with Linux.

5

• Taken from Nieh and Leonard (2000)

6

• It makes a standard PC hardware within a VM
  appear to run multiple unmodified PC operating
  systems simultaneously on the same machine.
• Done by running each operating system in its own
  VM.
• Still need a native OS to the machine host OS.
• An OS running as effectively as an application on
  top of VMware is called a "guest OS."

7
Virtual PC

• Microsofts Virtual PC download from
  http//www.microsoft.com/windows/downloads/virtual
  pc/default.mspx
• Free
• Works in a similar way to VMWare

8
Issues

• http//www.bcs.org/server.php?showConWebDoc.9428
• http//www.bcs.org/server.php?showConWebDoc.18204
  
• http//www.bcs.org/server.php?showConWebDoc.20446
  

9
Storage virtualisation

• An unlimited number of storage resources over
  shared physical storage infrastructure, i.e. SAN
  (Storage Area Network).

10
Desktop Virtualisation

• desktop operating systems are installed onto
  emulated hardware.
• Or, Users accessing a remote desktop on a
  multi-user operating systems. 

11
Network Virtualisation

• Example, Cisco Systems VLAN technology allowing
  logical segmentation of network.

12
References

• Mann and Andi (N/A), Virtualization 101,
  Enterprise Management Associates (EMA),
  lthttp//www.emausa.com/ema_lead.php?lsvirtwpws080
  6bsvirtwp0806gt.
• Cited by Wikipedia.
• Nieh J and Leonard OC (2000) Examining Vmware
  DrDobbs Journal http//www.ncl.cs.columbia.edu/pu
  blications/drdobbs2000.pdf
• http//www.bcs.org/server.php?showConWebDoc.9428
• http//www.bcs.org/server.php?showConWebDoc.18204
  
• http//www.bcs.org/server.php?showConWebDoc.20446