Server Virtualisation part 3

Question 1

What is a hosted hypervisor (Type 2)?

Answer 1

It runs on top of a conventional operating system just as the other computer programs do. Hosted hypervisor abstracts guest operating systems from the host operating system. diagrams in notes

Question 2

What is a native hypervisor (Type 1)?

Answer 2

It runs directly on the host’s hardware to control the hardware and to manage guest operating systems. It is sometimes called bare metal hypervisors. It represents the original implementation of the hypervisor.

Question 3

What does hypervisor do?

Answer 3

Hypervisor schedules VM’s access to the underlying physical hardware on the host server
i.e. hypervisor makes every VM think they own the entire physical machine.

Question 4

Explain the following benefit of virtualisation: Isolation

Answer 4

VMs are safely separated and do not affect each other, e.g. compromised (hacked) servers are contained.

Question 5

Explain the following benefit of virtualisation: Manageability.

Answer 5

VMs are software - easy and cheap to create, back up, restore, replace, replicate, delete and patch etc

Question 6

Explain the following benefit of virtualisation: Hardware independent

Answer 6

VMs are independent of physical servers, that is, they can run across different hardware platforms.