VMWare has published a nice white paper about the scalability and performance implications of running many Citrix Presentation Servers hosted on Virtual Machines. Following is the introduction to the white paper:

“Citrix Presentation Server administrators have often opted for many small servers (with one or two CPUs) to run Citrix Presentation Server server farms. Due to the limitations in the underlying operating systems, it has been difficult to scale the number of Citrix Presentation Server clients that can be supported on a server as the number of CPUs in the server is increased. With multiple-core processors becoming the norm, and servers with four to eight CPUs
providing the best price point for servers, it is important for applications in the data center to be effective in scaling to servers with larger numbers of CPUs. Using VMware ESX Server it is possible to use larger servers as the infrastructure for a Citrix Presentation Server implementation.”

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