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What is VM Ware ?

Virtualization is the process of creating a “virtual” version of something, such as computing environments, operating systems, storage devices or network components, instead of utilizing a physical version for certain aspects of a company’s infrastructure.

For example, server virtualization is the process in which multiple operating systems (OS) and applications run on the same server at the same time, as opposed to one server running one operating system. If that still seems confusing, think of it as one large server being cut into pieces. The server then imitates or pretends to be multiple servers on the network when in reality it’s only one. This offers companies the capability to utilize their resources efficiently and lowers the overall costs that come with maintaining servers.

Types of Server Virtualization:

Hypervisor

A hypervisor or virtual machine monitor (VMM) is computer software, firmware or hardware that creates and runs virtual machines. A computer on which a hypervisor runs one or more virtual machines is called a host machine, and each virtual machine is called a guest machine. The hypervisor presents the guest operating systems with a virtual operating platform and manages the execution of the guest operating systems. Multiple instances of a variety of operating systems may share the virtualized hardware resources: for example, Linux, Windows, and macOS instances can all run on a single physical x86machine.

  1. Type I Hypervisor: Bare-metal virtualization hypervisors

Hypervisor

A hypervisor or virtual machine monitor (VMM) is computer software, firmware or hardware that creates and runs virtual machines. A computer on which a hypervisor runs one or more virtual machines is called a host machine, and each virtual machine is called a guest machine. The hypervisor presents the guest operating systems with a virtual operating platform and manages the execution of the guest operating systems. Multiple instances of a variety of operating systems may share the virtualized hardware resources: for example, Linux, Windows, and macOS instances can all run on a single physical x86machine.

 

  • Is deployed as a bare-metal installation (the first thing to be installed on a server as the operating system will be the hypervisor).
  • The hypervisor will communicate directly with the underlying physical server hardware, manages all hardware resources and support execution of VMs.
  • Hardware support is typically more limited, because the hypervisor usually has limited device drivers built into it.
  • Well suited for enterprise data centers, because it usually comes with advanced features for resource management, high availability and security.
  • Bare-metal virtualization hypervisors examples: VMware ESX and ESXi, Microsoft Hyper-V, Citrix Systems XenServer.
  1. Type II Hypervisor – Hosted virtualization
  • The software is not installed onto the bare-metal, but instead is loaded on top of an already live operating system, so it requires you to first install an OS(Host OS).
  • The Host OS integrates a hypervisor that is responsible for providing the virtual machines(VMs) with their virtual platform interface and for managing all context switching scheduling, etc.
  • The hypervisor will invoke drivers or other component of the Host OS as needed.
  • On the Host OS you may run Guest VMs, but you can also run native applications
  • This approach provides better hardware compatibility than bare-metal virtualization, because the OS is responsible for the hardware drivers instead of the hypervisor.
  • A hosted virtualization hypervisor does not have direct access to hardware and must go through the OS, which increases resource overhead and can degrade virtual machine (VM) performance.
  • The latency is minimal and with today’s modern software enhancements, the hypervisor can still perform optimally.
  • Common for desktops, because they allow you to run multiple OSes. These virtualization hypervisor types are also popular for developers, to maintain application compatibility on modern OSes.
  • Because there are typically many services and applications running on the host OS, the hypervisor often steals resources from the VMs running on it
  • The most popular hosted virtualization hypervisors are: VMware Workstation, Server, Player and Fusion; Oracle VM VirtualBox; Microsoft Virtual PC; Parallels Desktop

What is server virtualization?

Server virtualization is a technology for partitioning one physical server into multiple virtual servers. Each of these virtual servers can run its own operating system and applications, and perform as if it is an individual server. This makes it possible, for example, to complete development using various operating systems on one physical server or to consolidate servers used by multiple business divisions.

By the end of the course, you should be able to meet the following objectives:

  • Describe the software-defined data center
  • Explain the vSphere components and their function in the infrastructure
  • Deploy an ESXi host
  • Deploy VMware vCenter® Server Appliance™
  • Use a local content library as an ISO store and deploy a virtual machine
  • Describe vCenter Server architecture
  • Use vCenter Server to manage an ESXi host
  • Configure and manage vSphere infrastructure with VMware Host Client™ and VMware vSphere® Web   Client
  • Describe virtual networks with vSphere standard switches
  • Configure standard switch policies
  • Use vCenter Server to manage various types of host storage: VMware vSphere® VMFS, NFS, iSCSI, and RDM
  • Examine the features and functions of Fibre Channel
  • Manage virtual machines, templates, clones, and snapshots
  • Create, clone, and deploy a vApp
  • Describe and use the content library
  • Migrate virtual machines with VMware vSphere® vMotion®
  • Use VMware vSphere® Storage vMotion® to migrate virtual machine storage
  • Monitor resource usage and manage resource pools
  • Use esxtop to identify and solve performance issues
  • Discuss the VMware vSphere® High Availability cluster architecture
  • Configure vSphere HA
  • Manage vSphere HA and VMware vSphere® Fault Tolerance
  • Use VMware vSphere® Replication™ and VMware vSphere® Data Protection™ to replicate virtual   machines and perform data recovery
  • Use VMware vSphere® Distributed Resource Scheduler™ clusters to improve host scalability
  • Use VMware vSphere® Update Manager™ to apply patches and perform basic troubleshooting of ESXi hosts, virtual machines, and vCenter Server operations
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