Virtualization Concepts: Virtual machines
- 1. Unit - 10 Virtualization Concepts Operating System (OS) GTU # 3140702
- 2. Looping Outline • Virtualization • Virtual Machines • VM Advantages & Dis-advantages • Virtual Machine Application • Type of Virtual Machine • VirtualBox • VMware Workstation • Microsoft Hyper – V • Uses of Virtual Machine
- 4. What is Virtualization? Virtualization is the process of creating a software-based, or virtual, representation of something, such as virtual applications, servers, storage and networks. It is the single most effective way to reduce IT expenses while boosting efficiency and agility for all size businesses. Benefits of Virtualization: Reduced capital and operating costs. Increased IT productivity, efficiency, agility and responsiveness. Faster provisioning of applications and resources. Greater business continuity. Simplified data centre management.
- 6. Virtual Machine Virtual Machine is a separate individual operating system installation on your usual operating system. It is implemented by software emulation and hardware virtualization.
- 7. Virtual Machine – Cont. Virtual machine is a software implementation of a physical machine - computer - that works and executes analogically to it. Virtual machines are divided in two categories based on their use and correspondence to real machine. System virtual machines: It provides a complete system platform that executes complete operating system. Process virtual machines: It will run a single program.
- 8. Virtual Machine Advantages & Dis-advantages VM Advantages: Multiple OS environments can exist simultaneously on the same machine, separate from each other; Virtual machine can offer an instruction set architecture that differs from real computer. Easy maintenance, application provisioning, availability and convenient recovery.
- 9. Virtual Machine Advantages & Dis-advantages VM Dis-advantages: When multiple virtual machines are simultaneously running on a host computer, each virtual machine may introduce an unstable performance, which depends on the workload on the system by other running virtual machines. Virtual machine is not that much efficient as a real one when accessing the hardware.
- 10. Virtual Machine Applications Virtual Machine isolates the hardware of our computer such as CPU, hard drives, memory, NIC (Network Interface Card) etc, into many different execution environments as per our requirements, feel like a single computer. Examples: VirtualBox, VMWare Workstation & Microsoft Hyper-V.
- 11. Type of Virtual Machine Full Virtualization: Virtual machine simulates hardware to allow an unmodified guest OS to be run in isolation. There is two type of full virtualizations in the enterprise market. On both full virtualization types, guest operating system’s source information will not be modified. 1. Software assisted full virtualization 2. Hardware-assisted full virtualization
- 12. Full Virtualization It is also referred as true or pure virtualization. It completely relies on binary translation to trap and virtualize the execution of sensitive, non-virtualizable instructions sets. It emulates the hardware using the software instruction sets. Due to binary translation, it often criticized for performance issue. Example: VMware Workstation VirtualBox Microsoft Hyper - V VMware Server
- 13. VirtualBox VirtualBox is a great, open-source application that runs on Windows, macOS, and Linux. One of the best parts about VirtualBox is that there’s no commercial version. This means you get all features for free, including advanced features like snapshots. This allows you to save a virtual machine’s state and revert to that state in the future, which is great for testing.
- 15. VMware Workstation VMware Workstation allows for the installation of multiple instances of different operating systems, including client and server operating systems. It helps the network or system administrators to check, test and verify the client server environment. Administrator can also switch between different virtual machines at same time. VMware Workstation has its limitations, including hardware support, operating system issues, and network protocols hurdles.
- 17. Microsoft Hyper-V Hyper-V is virtualization software that virtualizes software. It can not only virtualize operating systems but also entire hardware components, such as hard drives and network switches. Unlike VirtualBox. Hyper-V is not limited to the user’s device. You can use it for server virtualization. Hyper-V is available in three versions. 1. Hyper-V for Windows Servers 2. Hyper-V Servers 3. Hyper-V on Windows 10
- 19. Uses of Virtual Machine Take trial on newer versions of operating systems Virtualization from your own desktop Test with different operating systems Utilizing software that requests an outdated operating system Run software formatted for other operating systems Test software on many different platforms Compile different servers for business use Safety and Security
- 20. Operating System (OS) GTU # 3140702