Page 264 - How Cloud Computing Is Transforming Business and Why You Cant Afford to Be Left Behind

GL OS SARY

Virtual machine: A unit of a physical server that has been di-
vided into multiple virtual servers, controlled by software. Each
owns a share of the CPU and other physical resources and is
supervised by a shared hypervisor, which manages calls for
hardware services and resolves conflicts.

Workload: A common data center term for an application and
the data it must process in a discrete job on a server. In cloud
computing, workloads tend to be formatted as virtual appli-
ances (which include an operating system and other compo-
nents) and sent to a cloud, where they are run.

WSDL: Web Services Description Language, a standard way of
describing services available over the Internet.

Xen: An open source hypervisor that has been adopted and

modified for use as the governing hypervisor in the Amazon
Web Services Elastic Compute Cloud (EC2). Xen is also the
basis of virtualization products from the XenSource unit of
Citrix Systems and from Oracle and Sun.

XML: eXtensible Markup Language, a subset of General Markup
Language, used in building SOAP-based Web services on the
Internet. XML governs the content of a Web page.

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