The benefit of virtualizing x86 servers is clear: break the link between software and hardware and create the foundation for a more dynamic, flexible and efficient data center. With the market for virtualization software expected to grow to more than $1 billion this year, companies are more than kicking the tires on the technology. But the road to a virtual data center isn’t without its twists and turns. The move to a virtual environment must be done carefully and with an understanding of how the new infrastructure will change IT planning and management. What follows is a list of eight virtualization “gotchas" — hurdles that users may face as they deploy virtual environments — that we’ve compiled through discussions with IT professionals, analysts and vendors.

1. Forgoing the physical: The idea of moving to a virtual environment is to run more virtual workloads on fewer physical systems, but that doesn’t mean hardware moves down on the list of priorities. If organizations don’t carefully consider what physical resources are necessary to support virtual workloads and monitor the hardware resources accordingly, they may find themselves in trouble. “With virtualization, it’s really a matter of putting the right physical systems behind it," says David Payne, CTO at Xcedex, a virtualization consulting firm based in Minneapolis. “Some people think they can buy a cheap system from Dell or HP, throw in the hardware, then put virtualization on top of it and have their virtual environment. But many times that’s done based on commodity price, rather than really considering what the virtual workloads are going to be. The companies we’ve worked with that have been most successful have paid a lot of attention to the planning portion and they end up with a really good result, getting high utilization on these systems and a really good consolidation ratio."