1 / 21

Virtualization

What is virtualization? Why virtualize? Virtualization architectures How virtualization affects networking Virtual infrastructure and how it fits into Cloud computing. Virtualization. Virtualization is the creation of substitutes for real resources – abstraction of real resources

alexanderwallace
Download Presentation

Virtualization

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. What is virtualization? Why virtualize? Virtualization architectures How virtualization affects networking Virtual infrastructure and how it fits into Cloud computing Virtualization

  2. Virtualization is the creation of substitutes for real resources – abstraction of real resources Users/Applications are typically unaware of the substitution (layer of abstraction) Examples: computing systems/servers network storage (e.g. SAN) network resources (e.g. VLANs, VPNs, HSRP - virtual ip address assignment). What is virtualization?

  3. Virtualization lifecycle

  4. A virtual machine is a tightly isolated software container that can run its own operating systems and applications as if it were a physical computer. An old idea: was first introduced by IBM in the 60’s X86 virtualization introduced in the 90’s by VMWare On a given h/w platform – simulated (virtual) physical machines are created Can boot/run multiple instances of different OS on the same physical machine System/Server virtualization

  5. Workloads consolidation to reduce hwcosts- today’s powerful hw can support multiple VMs Single consolidated view/management of VMs Portability of virtual machines-can migrate VMs from one machine to another without shutting down Isolation VMs are protected from each other and from hw resources Can be used for testing/training/software development- run multiple Oss simultaneously ISP hosts/Cloud computer provides can divide a single physical machine to different customers Why virtualization?

  6. System (Server) Virtualization

  7. Hypervisor functionality

  8. Virtualization approaches - Hosted • Hosted approach – host O/S runs virtualization software, unmodified guest O/Ss run isolated from each other (separate virtual machines) • Virtualization software is known as Type 2 hypervisor • Additional resources are required for host O/S • Example: Microsoft Virtual PC, VMWare Workstation

  9. Hosted Architecture

  10. Virtualization approaches - Hypervisor • Hypervisor (bare-metal or type 1) approach – there’s no host O/S. Virtual machines run on top of type 1 hypervisor directly on a hardware platform • No resources are wasted for a Host O/S • Higher virtualization efficiency can be achieved • Example: VMWare ESX Server

  11. Hypervisor or Bare-metal Architecture

  12. Paravirtualization • Guest O/S is modified to include a call to hypervisor to access h/w resources • Guest O/S is “aware” of running in a virtualized environment • Makes the structure of hypervisor simpler • May make virtual machine more efficient • Can be a problem when Guest O/S can’t be modified (proprietary O/S)

  13. X86 architecture – privilege levels

  14. Virtualization – ring de-privileging

  15. Paravirtualization

  16. HW Virtualization • Virtualization on x86 machines was difficult to implement, involved a lot of overhead • Starting in 2005 both Intel and AMD introduced processors enabled for virtualization – Intel VT and AMD-V Pacifica • Both employ virtualization extensions to x86 architecture to allow more efficient virtualization

  17. X86 architecture – with virtualization Paravirtualization Binary Translation

  18. X86 architecture – with HW- assisted virtualization

  19. Virtual machine networking • Virtual Embedded Bridge – a software switch as part of the hypervisor

  20. Traditional Infrastructure

  21. Virtual Infrastructure

More Related