Describes a reference architecture and performance testing for Microsoft® Lync® 2010 client applications running within a Citrix® XenDesktop® 5.6 virtual desktop environment using Dell servers and thin clients. The Citrix HDX RealTime Optimization Pack for Microsoft® Lync® decreased the processing load on the virtual desktops and the amount of network bandwidth consumed. The Optimization Pack allows the solution to take advantage of the capabilities of the Dell Wyse thin clients and scale collaborative services more effectively.
Dell and Citrix have developed a Unified Communications (UC) architecture to help organizations achieve cost savings and efficiencies when enabling collaborative services. This virtualized UC architecture supports Microsoft® Lync® 2010 client applications that execute within a Citrix Virtual Apps and Desktops, formerly XenDesktop VDI environment. Citrix Virtual Apps and Desktops provides on-demand enterprise delivery of Microsoft Windows® applications, including Microsoft® Lync®, allowing desktops to be virtualized, centralized, and managed within the corporate datacenter for better security, administrative simplicity, and reduced costs.
This paper describes a virtualized UC architecture for deploying Microsoft® Lync®2010 client applications within Citrix Virtual Apps and Desktops. It presents performance and scalability tests jointly conducted by Citrix and Dell engineers, and analyzes the results of that testing to help customers confidently size virtualized deployments for Microsoft® Lync® client delivery.
The software technologies in this architecture deliver a rich multimedia experience for collaborative applications in a VDI environment. The software components include:
This section introduces the general functionality of each component and discusses configuration settings within Citrix Virtual Apps and Desktops relative to the reference architecture for Microsoft® Lync®.
Microsoft® Lync® imposes a computationally intensive workload on servers, especially because of its requirement to drive real-time audio and video output across low-bandwidth networks. To meet requirements for voice and video conferencing, the VDI architecture must be capable of fast compute processing, low latencies, high throughput, and fast video rendering.
To understand the capabilities of the design and the user densities that it can support, testing focused on the highly demanding workloads of audio and video conferencing. Since instant messaging (IM) imposes a nominal impact on performance and user densities, it was not part of the tested workload.