Organizations of all sizes are looking at how their data center facilities can support their IT requirements for greater flexibility and responsiveness using cloud computing and virtualization. But implementing these technologies and strategies in existing data center environments is easier said than done. Data center managers must take their data center, which can be up to 15 years old, and rebuild it using the latest deployment principles. One approach here is to take a more modular approach to data center design. The initial adopters of this strategy five years ago were Amazon and Google, and they are usually the reference for data center best practices in current deployment methodology. For companies evaluating where modular data center assets can help their own strategies, there are both lessons to be learned and pitfalls to avoid.