Transcript Virtualisation

Week 20
Virtualization
This week

Virtualization
–
–

What is it?
Software on different operating systems?
Group Presentations – 10-15 minutes per
group
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 from:Mann and Andi (N/A
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.

Taken from Nieh and Leonard (2000)




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."
Virtual PC



Microsoft’s Virtual PC download from:
http://www.microsoft.com/windows/downloads/
virtualpc/default.mspx
Free
Works in a similar way to VMWare
Issues



http://www.bcs.org/server.php?show=ConWeb
Doc.9428
http://www.bcs.org/server.php?show=ConWeb
Doc.18204
http://www.bcs.org/server.php?show=ConWeb
Doc.20446
Storage virtualisation

An unlimited number of storage resources over
shared physical storage infrastructure, i.e. SAN
(Storage Area Network).
Desktop Virtualisation


desktop operating systems are installed onto
emulated hardware.
Or, Users accessing a remote desktop on a
multi-user operating systems.
Network Virtualisation

Example, Cisco Systems VLAN technology
allowing logical segmentation of network.
References
Mann and Andi (N/A), Virtualization 101, Enterprise Management Associates
(EMA),
<http://www.emausa.com/ema_lead.php?ls=virtwpws0806&bs=virtwp0806>.
Cited by Wikipedia.

Nieh J and Leonard OC (2000) “Examining Vmware” DrDobbs Journal
http://www.ncl.cs.columbia.edu/publications/drdobbs2000.pdf

http://www.bcs.org/server.php?show=ConWebDoc.9428

http://www.bcs.org/server.php?show=ConWebDoc.18204

http://www.bcs.org/server.php?show=ConWebDoc.20446
