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CHAPTER 2 Discovering Virtual Desktop Infrastructure 19 These materials are © 2020 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Chapter 2 IN THIS CHAPTER » Understanding key VDI concepts » Identifying the factors that affect VDI performance » Sizing VDI hardware resources Discovering Virtual Desktop Infrastructure V irtual desktop infrastructure (VDI) isn't a new concept at all, but it's one of those services that has just enough cost and complexity that it still confounds people who don't always look at it for the right reasons. It used to be seen as a cost- savings opportunity. Thanks to hardware complexity at the time and the introduction of software specific to supporting VDI work- loads, direct cost savings didn't always emerge. Instead, VDI enables other outcomes, including providing inher- ent flexibility for users and, in many cases, increasing the overall security posture of the organization. Understanding Key VDI Concepts The two most popular VDI solutions come from Citrix and VMware. Citrix was a pioneer in server-based computing, so it's no surprise that it continues to lead with Citrix Virtual Apps and Desktops. VMware found great success in server virtualization and translated this to the desktop world with VMware Horizon View. Table 2-1 outlines the main components present in both Citrix and VMware VDI environments.