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Abstract
Cloud computing has been envisioned as the next generation architecture of IT enterprise. Cloud computing moves the application software and data bases to the large data centers, where the management of the data and services may not be fully trustworthy. There are many benefits to using cloud storage, most notable is file accessibility. Files stored in the cloud can be accessed at any time from any place so long as you have Internet access. Another benefit is that cloud storage provides organizations with off-site (remote) backups of data which reduces costs associated with disaster recovery. Unfortunately, the biggest disadvantage to cloud storage is that users are limited by bandwidth. If your Internet connection is slow or unstable, you might have problems accessing or sharing your files. Organizations that require a large amount of storage may also find costs increase significantly after the first few gigabytes of data stored. There are two key elements at the core of cloud computing technology, which are: SOA (Service Oriented Architecture) and cloud virtualization, which are described in this paper. SOA facilitates cloud computing by making software easier to distribute in the cloud. It can be an alternative to virtualization in server-sharing, or it can use virtualization to improve performance and reliability.