Glossary Cloud computing
A model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources (e.g. networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction (The National Institute of Standards and Technology [NIST]).
Dedicated IT
A non-cloud based environment with non-virtualized servers and without any of the key characteristics associated with cloud computing.
Hybrid cloud
The delivery of a cloud service through a combination of both the public and private cloud model.
Infrastructure as a service (IaaS) Provides the processing, storage and capability to a user.
IT estate The entire suite of information technology which supports the business.
Platform as a service (PaaS) Provides a development platform for the design and test of custom applications.
Private cloud
A service operated exclusively for one firm. This service can be provided either internally or externally by a third party provider (for the purposes of the analysis in this report, the private cloud was assumed to be provided internally rather than by a third party. The data collected through the interviews indicated this was the dominant scenario).
Server virtualization The creation of multiple server instances on one physical server machine.
Software as a service (SaaS) Provides applications through a centralized network allowing access over the internet or intranet.
Virtual private cloud (VPC) A cloud service that is only accessible via a private network connection and not through the public internet.
Public cloud When a third party is providing the cloud service and does so on a multi-tenant basis such that different firms share the same infrastructure, platform or instance of the software application.
PUE
Power usage effectiveness is a data center efficiency measure and calculates the ratio of total power consumed by a data center against the total power consumed by the IT equipment.
Server utilization rate This denotes the percentage of maximum power which is being used by the server.
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