Virtualization

Virtualization

1. benefits

   • Virtualization
   • cloud computing
   • reduced capital
   • server consolidation
   • Increase IT

2. hypervisors

   • hosted
     • VM workstation, Microsoft virtual PC
     • runs as a software layer
   • bare metal
     • runs directly on the host's hardware
     • VMware ESX

3. running multiple OS and user application on same

4. challenges

   • security
   • VM sprawl
   • backup

5. drawbacks

   • security risk
   • availability issue
   • scalability issue
   • high cost

6. para virtualization

   • Guest OS knows that it is virtualized

7. Full virtualization

   • Guest OS is not aware of being virtalized
   • VMM runs in the privileged Ring 0