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sound like a cloud expert: introduction to the cloud
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Cloud terminology, concepts, and drivers
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Terminology & Concepts
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A cloud: remotely provisioned IT environment
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Cloud computing: IT resource delivered as a service over the
internet
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IT resources: software, hardware, network, storage
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SaaS: Software as a Service, applications such as gmail or
salesforce
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IaaS: Infrastructure as a Service, for example a server,
data storage or network
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PaaS: Platform as a Service, infrastructure and software provided as tools to enable you to create and host your own
applications in the cloud
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On-Premise: IT resource hosted conventionally (non cloud) within
a companies boundary
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Cloud consumers: the user of a cloud service
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Cloud providers: the company selling/providing a cloud service
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Scaling: IT resource able to increase or decrease usage on demand
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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
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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
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Virtualization: software allowing a physical IT resource to be shared by providing multiple images of itself
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Cluster: collection of independent (same type) resources connected up
to provide a single system
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Enabling technology: the technology witch allows cloud computing to exists, for
example the key technologies of broadband, and the internet
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Cloud Drivers
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Capacity planning, elastic on demand professional technology
allows for rapid change and growth
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Capacity planning: on demand instant commissioning and
releasing of services
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Capacity planning: pay-as-you-go services
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Capacity planning: scalable services
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Capacity planning: hence a reduced need for resource planning
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Cost, lower start-up costs allows capital to be focused on
the core business
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Cost: lower initial capital cost outlay (non purchase/ownership of
the resources)
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Cost: lower ownership and operational outlay (fewer, or no
staff)
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Availability and reliability, from the use of well architected and
reliable providers
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Availability and reliability: pooled, clustered and virtualised resources
provide redundant environments e.g. 99.9% uptime
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Availability and reliability: rated providers have extensive expert
support
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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’
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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.