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42 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. Ghost is still around for physical machines, but for VDI environ- ments, the software-centric nature of a virtual machine enables some new opportunities. With every VDI solution come tools to help administrators create and manage master images for each type of virtual desktop in their VDI environment. For VMware, that is the job of either Horizon Composer or Horizon Enterprise Instant Clones. If you're using Instant Clones only, you don't need to deploy a Composer server or database because everything is handled via the Instant Clones tool. In Citrix, two tools are used for image management: » Machine Creation Services (MCS): MCS is managed via the Citrix Studio and builds linked clones from a master image that you create. Each clone includes a differencing disk, which is akin to the delta disk used in a VMware Horizon deployment. MCS also supports the creation of full clones for times when you don't want to or can't use a differencing disk. » Citrix Provisioning (PVS): PVS is a streaming technology that streams desktop images to supported devices rather than simply copying images to them. PVS is highly scalable and reduces the overall storage footprint needed for disk images. You can stream PVS images to virtual desktops and even to physical desktops, which is how you can get away with not having to create images for all of the desktops in your environment. MCS supports dedicated and pooled virtual desktops as well as desktops hosted in AWS and Azure. PVS supports streaming to both virtual desktops and physical desktop devices but not to cloud-based virtual desktops. A lot of additional nuance surrounding the MCS versus PVS issue is beyond the scope of this book. If you're deploying Citrix VDI, make sure to read Citrix's detailed documentation on this topic to make sure you know all of the use cases for both technologies. Regardless of which VDI solution you choose, the first step in your deployment process consists of creating a master, golden, or parent image that includes agent software. The same process applies to DaaS environments. For example, in Xi Frame on Nutanix AHV, to get started you need to create a master image that resides in the AHV environment and has the