Distributed Clouds: Modularity and Deployment Methods

使用云服务的客户经常被发现没有意识到它们的一些缺点。这些问题包括：(1)需要明确复制服务以适应区域故障，(2)无法对数据位置进行细粒度控制，以及(3)大型大数据中心可能驻留在受截然不同的隐私法管辖的区域。尽管存在这些缺点，但云提供了负担得起、高效、可动态扩展的基础设施，这对于满足不断增长的用户群和海量数据集的需求至关重要。社会的几乎每一个维度都依赖于当今的云服务，包括研究、政府、工业、医疗保健、教育、公民科学和娱乐。

Clients using cloud services are often caught unaware of some of their drawbacks.  These include: (1) the necessity to explicitly replicate services to accommodate zone failures, (2) the inability to have fine grain control over location of data, and (3) the fact that large megadata centers may reside in areas subject to vastly different privacy laws. Despite these drawbacks, clouds provide affordable, effective, dynamically scalable infrastructure vital to meet the needs of growing user populations and massive data sets. Almost every dimension of society relies on today's cloud services, including research, government, industry, healthcare, education, citizen science, and entertainment.