Question

Answer the following questions briefly. You do not have to repeat everything in the book. Just highlight the key points and identify distinction in various approaches. a) How many levels of virtualization can one consider? Comment on their advantages, shortcoming, and limitation. b) What are the typical systems that you know of that have been implemented at each level in the past? c) What are the difference between full virtualization and paravirtualization? Explain at the advantages, and shortcomings, and limitation in the implementation and applications of either class of VMs on today’s host machines.

Answer 1

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a)

5 levels of virtualization

• Hardware Virtualization – This is the utilization of registering equipment in a climate separate from the genuine presence of the equipment. There are various degrees of equipment virtualization including full, incomplete and paravirtualization. Each has its own favorable circumstances and extraordinary qualities.
• Virtual Machine – A virtual machine is a product clone of a genuine PC that executes programs as though it were the PC. Different sorts of programming virtualization strategies incorporate virtual apparatus, application virtualization, cross-stage virtualization and OS virtualization.
• Capacity Virtualization – Just as the name infers, the attention is on isolating physical stockpiling from genuine capacity.
• Desktop Virtualization – The capacity to work a figuring climate distantly.
• Network Virtualization – The production of work space inside a bigger organization or across networks utilizing virtualization strategies

b).

Instruction Set Architecture Level (ISA)
ISA server
   Hardware Abstraction Level (HAL)
VMWARE,IBM VM/370,Xen hypervisors and x86 based machines.
   Operating System Level
       Virtual Environment.
   Library Level
vCUDA ,WINE
   Application Level
       BIRD, DYNAMO

c)differences between full virtualization and para-virtualization:

Full virtualization:

1.Guest working frameworks are unconscious of one another

2.Provide help for unmodified visitor working framework.

3.Hypervisor straightforwardly connect with the equipment, for example, CPU,disks.

4.Hyperwiser permit to run different os at the same time on have PC.

5.Each visitor worker run on its own working framework

Barely any executions: Oracle's Virtaulbox , VMware worker, Microsoft Virtual PC

advantages:

This sort of virtualization give best seclusion and security to Virtual machine.

Genuinely secluded various visitor os can run all the while on same equipment.

3.It's just alternative that requires no equipment help or os help to virtualize touchy and favored guidelines.

Limitations

1.full virtualization is normally chomped more slow ,as a result of all copying.

2.hyoerwiser contain the gadget driver and it may be hard for new gadget drivers to be installer by clients.

Para virtualization:

1.unlike full virtualization ,visitor workers know about each other.

2. Hypervisor needn't bother with a lot of handling capacity to oversee visitor os.

3 .The whole framework function as a strong unit.

Advantages

As a visitor os can legitimately speak with hypervisor

This is effective virtualization.

Permit clients to utilize new or altered gadget drivers.

Limitations:

Para virtualization requires the visitor os to be altered so as to cooperate with para virtualization interfaces.

It needs critical help and maintaibilty issues underway climate.