Microsoft WVD provides the functionality of a Connection Broker, acting as a load balancer and session manager. WVD is a PaaS offering from Azure that provides a compelling alternative to VDI and RDS. There is also administrative overhead related to systems that support VDI as well as licensing costs. VDI environments need server hardware with RAM and CPU capacity to handle the peak user load, as well as data storage with sufficient input/output operations per second (IOPS) to handle users logging in and working throughout the day. Hosting a VDI environment on-premises requires an investment in technology. Unlike RDS, which supports multiple users on a Session Host, VDI supports one virtual desktop per user. Users log in to one of these virtualized desktops to use services just as they would a local desktop. VDI creates a pool of OS instances in a virtualized hypervisor environment using virtualization software such as VMware, Citrix, or Hyper-V. These shortcomings have led to the popularity of Virtual Desktop Infrastructure (VDI). Until recently, the Windows client OS did not support multiple user sessions. Some third-party applications will not work on a server OS or in a multi-user environment. A server OS requires different sets of Group Policies and may require cosmetic changes to the desktop, such as the start menu layout and background images. Windows RDS leverages a server operating system (OS) to provide multiple desktops on a single server instance. Although the solution works, the infrastructure required for RDS is relatively costly, depending on the number of servers needed. It is not uncommon to deploy RDS environments in Azure.
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