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24 End-User Computing For Dummies, Nutanix Special Edition These materials are © 2020 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Security servers and gateways Not every user will connect to your VDI environment from within your corporate network, and they may not be using a company issued laptop. For them, you may consider the deployment of security servers and gateways intended to provide access to exter- nal clients. In VMware Horizon, this service is provided by the VMware Unified Access gateway, which handles direction of authentica- tion requests from external clients as well as direction of clients to connection servers. For Citrix VDI deployments, Citrix Gateway handles these services and provides security and access control policies for endpoints attempting to connect to the environment. Sizing a VDI Environment Perhaps one of the biggest challenges in a VDI scenario is sizing it appropriately. Early forays into VDI often failed due to either a miscalculation of certain resource needs or a failure to fully understand all of the variables involved. Nutanix makes available a sizing tool that helps you to determine the number of nodes, the power draw, amount of rack space, and more, for your VDI deployment. If you'd like to try it for yourself, visit https://sizer.nutanix.com/#/. Determining the factors that affect host utilization A number of factors and variables affect how much capacity you need in terms of CPU, random access memory (RAM), storage capacity, storage performance, and network bandwidth. The goal is to optimize the desktop density per host. Concurrent desktop instances The number of desktops that you need to run simultaneously has the most significant impact on your host utilization. This number may differ from the total number of virtual desktops that you