What is Virtualization?
Outline
Isomorphism
Virtualization Properties
Isolation
Encapsulation
Interposition
Why Not the OS?
Virtualization Applications
Types of Virtualization
Taxonomy
System Virtual Machine Monitor Architectures
Traditional
Hosted Virtual Machines
Hosted Monitor Architecture
Hosted Architecture Tradeoffs
VMware ESX 2.0
Hybrid Ex 2 – Xen 3.0
Hypervisor

Hosted Architecture Tradeoffs
Positives
Installs like an application
No disk partitioning needed
Virtual disk is a file on host file system
No host reboot needed
Runs like an application
Uses host schedulers
Negatives
I/O path is slow
Requires world switch
Relies on host scheduling
May not be suitable for intensive VM workloads