Great Citrix XenDesktop, Cisco UCS, and EMC VNX solution overview for deploying 5000 virtual desktops.
Citrix XenDesktop 5.6 Feature Pack Built on Cisco Unified ComputingSystem and EMX VNX
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Reference Architecture-Based Design for 5000 Seat Virtual Desktop Infrastructure
Cisco Unified Computing System, Nexus 5500, Nexus 1000V, EMC VNX7500, and VMware ESXi 5