A Discussion

* Used Since1960’s starting with IBM System/360 * Grown in acceptance and usage by non Mainframe or “Big Iron” Environments only in recent years * Early adopters of Virtualization in smaller environments used primarily for testing and development purposes initially. * X86 Virtualization not available until 1999 When VMWare launched VMWare Virtual Platform

* Virtualization Actually Creates a underlying Hardware platform to run an Operating System on. * Emulation mimics another platform on a non- native platform * Virtualization uses emulation

* Better hardware efficiency * Security * Stability * Cost Effective*

* Mainframe * Servers (X86, PowerPC, Sparc, etc…) * Workstations, Desktops, Laptops (X86) * Mobile (Smart phones, etc…)

* Type I * Type II * Type 0? * Application

* Hypervisor runs directly on underlying hardware and all Operating Systems run on top of it, including any “Control” Operating systems with special permissions. * Usually Micro Kernel based * Typically includes: ESX, Hyper-V, XEN, KVM(Macro Kernel)

* Hypervisor runs on top of an existing host Operating System as a standard application process. * Traditionally all Hardware Emulated * Typically includes: VMWare Workstation, GSX, VMWare Player, VirtualBox, Parralells

* An unmanaged Hypervisor * Really nothing more than a subset of Type I (Which doesn’t really exist) * The more you know, the more it looks like something from the marketing department

* Really more like sandboxing an application than the other types of emulation listed * Less common, but becoming more so * Example Portable Apps

* Faster * Designed to be more secure * Generally better centralized management tools for scaling * Headless

* Runs in user space * Slower due to hardware emulation * More likely to cause host system instability