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Title:

Virtualization

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HSRP - virtual ip address assignment). 2. System (machine) Virtualization. A virtual machine is a tightly isolated ... May make virtual machine more efficient ... – PowerPoint PPT presentation

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Title: Virtualization


1
Virtualization
  • 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).

2
System (machine) Virtualization
  • 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.
  • Was first introduced by IBM in the 60s
  • X86 virtualization introduced in the 90s by
    VMWare
  • On a given h/w platform (host) simulated
    (virtual) machine environments are created
  • Benefits
  • consolidation to reduce hw costs
  • workloads consolidation
  • single consolidated view/management
  • portability of virtual machines
  • can be used for testing/training

3
System (machine) Virtualization
4
Hypervisor functionality
5
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

6
Hosted Architecture
7
Virtualization approaches - Hypervisor
  • Hypervisor (bare-metal or type 1) approach
    theres 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

8
Hypervisor or Bare-metal Architecture
9
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 cant be modified
    (proprietary O/S)

10
Paravirtualization
11
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

12
X86 architecture privilege levels
13
Virtualization ring de-privileging
14
X86 architecture with virtualization
Paravirtualization
Binary Translation
15
X86 architecture with HW- assisted
virtualization
16
Virtual machine networking
  • Virtual Embedded Bridge a software switch as
    part of the hypervisor

17
Virtual machine networking
  • External Hardware Switch switching function
    performed by an external switch

18
Traditional Infrastructure
19
Virtual Infrastructure
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