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Introduction to cloud computing terminology, concepts, and drivers.
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sound like a cloud expert: introduction to the cloud
Cloud terminology, concepts, and drivers
Terminology & Concepts
A cloud: remotely provisioned IT environment
Cloud computing: IT resource delivered as a service over the
internet
IT resources: software, hardware, network, storage
SaaS: Software as a Service, applications such as gmail or
salesforce
IaaS: Infrastructure as a Service, for example a server,
data storage or network
PaaS: Platform as a Service, infrastructure and software provided as tools to enable you to create and host your own
applications in the cloud
On-Premise: IT resource hosted conventionally (non cloud) within
a companies boundary
Cloud consumers: the user of a cloud service
Cloud providers: the company selling/providing a cloud service
Scaling: IT resource able to increase or decrease usage on demand
Horizontal Scaling: increase or decrease of the same type of resource, for example add or remove a server, or add new user accounts
to gmail
Vertical Scaling: able to replace an existing resource with a higher or lower spec for
example replace a 1 CPU server with a 2 CPU server
Virtualization: software allowing a physical IT resource to be shared by providing multiple images of itself
Cluster: collection of independent (same type) resources connected up
to provide a single system
Enabling technology: the technology witch allows cloud computing to exists, for
example the key technologies of broadband, and the internet
Cloud Drivers
Capacity planning, elastic on demand professional technology
allows for rapid change and growth
Capacity planning: on demand instant commissioning and
releasing of services
Capacity planning: pay-as-you-go services
Capacity planning: scalable services
Capacity planning: hence a reduced need for resource planning
Cost, lower start-up costs allows capital to be focused on
the core business
Cost: lower initial capital cost outlay (non purchase/ownership of
the resources)
Cost: lower ownership and operational outlay (fewer, or no
staff)
Availability and reliability, from the use of well architected and
reliable providers
Availability and reliability: pooled, clustered and virtualised resources
provide redundant environments e.g. 99.9% uptime
Availability and reliability: rated providers have extensive expert
support
Do you now understand Gartners definition of cloud computing? ‘a style of computing in which scalable and elastic IT-enabled capabilities are
delivered as a service to external customers using internet technologies’
CTO ‘sound like an expert’ series are short presentations introducing concepts and issues of cloud computing – this is the first in the series, introducing
the high level terminology and concepts. We hope you enjoyed it.
