Virtual desktops cut costs at Denver transportation agency

Network World - When your IT staff numbers only five people, an opportunity to reduce costs and make it easier to manage your desktop infrastructure is nothing to scoff at.

That's the conclusion Trent Ratcliff of the Regional Transportation District (RTD) in the Denver area came to when reviewing the potential of thin clients and desktop virtualization. Since the summer of 2007, Ratcliff and his team have been replacing desktops with Wyse thin clients, and using VMware virtualization technology to deliver standardized desktop images.

When the RTD used traditional PCs only, each one would be replaced after three years as part of an upgrade cycle that was expensive and time-consuming. Ratcliff, the IT infrastructure manager, says he has just five people in his group including his supervisor, and the regular replacement of desktops monopolized the time of two employees for months at a stretch.

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"That was where I started – I can't get any more head count, so what can I do to work smarter?" Ratcliff says.

The RTD is a public transportation system that serves seven counties in Colorado. Before starting the virtualization rollout, the agency had 1,200 or so desktops, plus 200 laptops and 150 high-end workstations. So far, RTD has replaced 400 of the desktops with thin clients, and is hoping to get that number up to 800 by year-end. The remaining desktops are relatively new and won't be replaced until 2010 or 2011, while several considerations are preventing virtualization of laptops and high-end workstations.

RTD is using Wyse V10L thin clients, with a Wyse thin operating system and the VMware View virtual desktop infrastructure software. Using VMware was a natural decision since Ratcliff was already using the vendor's ESX hypervisor to virtualize more than 90% of his servers.

RTD is delivering Windows desktop images from four storage-area network-connected IBM System x3850 servers, with 10 1 Gigabit Ethernet network interface cards in each machine. VMware View lets Ratcliff deliver hundreds of desktops from the servers by cloning a few base images. Each image is about 15GB, but storage needs are minimized because RTD just needs to save the base image one time, with extra storage needed only for the incremental changes applied to each desktop.

While virtualization can provide multiple operating systems and images for each machine, RTD is so far sending one image to each user. Common applications include Microsoft Office, Oracle ERP and Adobe Photoshop.

Ratcliff convinced his agency to undertake the project based on cost and environmental benefits. Instead of paying $950 for a PC that would last three years, RTD could acquire a Wyse thin client that would last eight or 10 years, at a cost of $800 ($300 for the Wyse thin client itself plus another $500 in Windows, VMware and other software fees). Including $53,000 in predicted energy savings each year, Ratcliff anticipates a $619,000 ROI after eight years.

Reprinted with permission from

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