9 4: Plan for
Real-World Testing Vendor white papers and marketing slide decks promise
high ratios of virtual desktops on each host server, but no one knows what an old, fat client loaded on dozens of Windows VMs will do to a server’s memory and CPU. That has to be tested in the real world. Instead of using formulas for planning server builds, load up legacy apps, clunky printer drivers, and spaghetti-coded scripts in the lab and capture the results before committing to a production design. You should, of course, be ready to quickly scale up when an unexpected event occurs or when the demand for virtual desktops increases.
5: Invest in App Performance
Management Tools In the past, WAN speed was measured from point to
point. Today, it means measuring through uncharted and opaque cloud computing services or across shared, multivendor WAN connections. Mobile computing response times will benefit greatly from VDI, and that is a critical selling point. But getting comparable performance from uncontrolled access points worldwide through VPN and wireless broadband clients requires explicit and targeted monitoring. Measuring end-to-end performance (from the server
to the user and back) requires a new suite of VDI tools. Because of the many hops from host to client, you must break out the layers and segments of the network/WAN connection and analyze each. By using a product like Firescope monitoring suite, you can pin down the root cause of glitches or outages, ideally before users feel the pain.
6: Consider
Pooling VMs Pooling desktop VMs is one of the elegant VDI solutions
for scaling up or down as needed to manage capacity. Instead of running virtual servers 24/7, a user login will call up a VM desktop or app to start on demand, and then stop again on logout releasing the license and resources back to the server. Pooling can be seen as a new kind of concurrent system that can reduce power, cooling, licensing and overall need for infrastructure. Creative types are rolling out some clever technologies that let user configurations follow this new login and logout behavior, like Appsense, which avoids cumbersome roaming profiles. Here is a list of particularly useful resources if you're considering a shift to VDI:
• VMware RAWC • Cisco Virtual Office • Citrix XenApp
© VOLODYMYR VASYLKIV
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VOLUME 3 • ISSUE 3
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