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Vitualisation

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Mobile Computing, Virtualization

Publicada em: Engenharia
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Vitualisation

  1. 1. VI R T U A LI Z A TI O N
  2. 2.  Virtualization is a framework or methodology of dividing the resources of a computer into multiple execution environments.  It can also be explicate as an abstraction layer that decouples the physical hardware from the operating system to deliver greater IT resource utilization & flexibility”.
  3. 3.  It is done by applying one or more concepts or technologies such as: Time-sharing, Partial or complete machine simulation, Hardware & software partitioning, Emulation, Quality of service, And many others. . .
  4. 4.  Virtualization technology enables multiple operating systems and application ‘images’ to share a single physical server.  A virtual server, or what is commonly known as a ‘virtual machine’, simulates the operations of your servers.  This enables an application to run on a machine as it would on a physical server.
  5. 5.  Its NOT A NEW CONCEPT  1960’s at IBM: M44/44X Project - the goal of which was being to evaluate the then emerging time sharing system concepts.  The architecture was based on virtual machines: The main machine was an IBM 7044(M44) and each virtual machine was an experimental image of the main machine(44X).  IBM & MIT headed research through the years & eventually developed the idea of a virtual Machine Monitor(VMM).
  6. 6.  The VMware virtualization platform is built on a BUSINESS- READY ARCHITECTURE.  Use software such as VMware vSphere to transform or “virtualized” the hardware resources of an x86-based computer— including the CPU, RAM, hard disk and network controller—to create a fully functional VIRTUAL MACHINE that can run its own operating system and applications just like a “real” computer.  Each virtual machine contains a complete system, eliminating potential conflicts. It works by inserting a thin layer of software directly on the computer hardware or on a host operating system.
  7. 7.  This contains a virtual machine monitor or “hypervisor” that allocates hardware resources dynamically and transparently.  Multiple operating systems run concurrently on a single physical computer and share hardware resources with each other.  By encapsulating an entire machine, including CPU, memory, operating system, and network devices, a virtual machine is completely compatible with all standard x86 operating systems, applications, and device drivers.  We can safely run several operating systems and applications at the same time on a single computer, with each having access to the resources it needs when it needs them.
  8. 8. x86 privilege level architecture without virtualization The binary translation approach to x86 virtualization The Paravirtualization approach to x86 Virtualization The hardware assist approach to x86 virtualization
  9. 9. Memory Virtualization
  10. 10. Device and I/O virtualization
  11. 11.  Modern computer systems are composed of various hardware & software layers.  Virtualization inserts a software layer(VMM) at different points in this architecture, comes in three variants:  Hardware-level virtualization,  Operating system-level,  High-level language virtual machines.
  12. 12.  Virtualization layer sits right on top of the real hardware.  Since the VM presents a version the real machine, all software written for that hardware(x86) will run on that virtual machine.  Original design from IBM in the 1960’s
  13. 13.  Virtualization layer sit between the operating system and the application programs that run on the operating system  Virtual Machine runs applications, or sets of applications written for the operating system but in a controlled environment  use host OS API  FreeBSD jails act like this.
  14. 14.  The virtualization layer sits as an application program on top of the operating system  Can run any programs written for that virtual machine abstraction regardless of the operating system hosting that virtual machine Real Machine OS JVM Java Byte Code Applications
  15. 15.  It enables us to get the most out of our server hardware.  It will allow us to set up redundant servers for better fault tolerance.  Management is simplified.  We can partition applications on separate OSes for greater reliability.  Provisioning new servers for prototyping, testing and migration is simplified.  We can save energy.  Virtual Desktop Infrastructure can save us a fortune on PCs
  16. 16.  SimOS  Microsoft Virtual Server  Mac-on-Linux  Linux-VServer  OpenVZ  Microsoft Virtual PC
  17. 17.  Hardware companies have taken notice of virtualizations growing popularity and advantages  Intel (called Virtualization Technology or VT-X Vander pool) and AMD (Pacifica) are releasing processors that have built in software virtualization support that try to eliminate emulation costs  This support will allow Xen to support unmodified unprivileged OS’s (hello Windows support)
  18. 18.  Many organizations across Australia are starting to take advantage of server virtualization to reduce power, cooling and equipment costs, reduce server administration and downtime, and gain a higher level of server redundancy.

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