Virtualizing and consolidating data-center servers provides such clear a financial benefit that there are few companies of any size, in any industry that shouldn’t virtualize at least some of their servers and applications, industry analysts say. But companies that start virtualization projects looking for cost savings, without planning for a second phase of migration that requires spending more on new tools than the project might save in short-term costs, will get stuck in phase one — saving money on hardware, but getting only a fraction of the benefit of the virtualization products they’ve bought, analysts add. [...]