Red Hat SATELLITE 5.3.0 RELEASE NOTES Informacje Techniczne Pobierz pdf (Strona 7)

2 Cloud Computing: Definitions

Cloud computing is a model for enabling 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. This cloud model promotes availability and is composed of four

essential characteristics, three service models, and four deployment models. The

following definitions have been proposed by National Institute of Standards and Technology

(NIST) in the document found at http://csrc.nist.gov/groups/SNS/cloud-computing/cloud-def-

v15.doc

2.1 Essential Characteristics

Cloud computing creates an illusion of infinite computing resources available on demand,

thereby eliminating the need for Cloud Computing users to plan far ahead for provisioning.

2.1.1 On-demand Self-Service

A consumer can unilaterally provision computing capabilities, such as server time and

network storage, as needed automatically without requiring human interaction with each

service’s provider.

2.1.2 Resource Pooling

The computing resources of the provider are pooled to serve multiple consumers using a

multi-tenant model, with different physical and virtual resources dynamically assigned and

reassigned according to consumer demand. There is a sense of location independence in that

the customer generally has no control or knowledge over the exact location of the provided

resources but may be able to specify a location at a higher level of abstraction (e.g., country,

state, or data center). Examples of resources include storage, processing, memory, network

bandwidth, and virtual machines.

2.1.3 Rapid Elasticity

Capabilities can be rapidly and elastically provisioned, in some cases automatically, to quickly

scale out and rapidly released to quickly scale in. To the consumer, the capabilities available

for provisioning often appear to be unlimited and can be purchased in any quantity at any

time.

2.1.4 Measured Service

Cloud systems automatically control and optimize resource use by leveraging a metering

capability at some level of abstraction appropriate to the type of service (e.g., storage,

processing, bandwidth, and active user accounts). Resource usage can be monitored,

controlled, and reported providing transparency for both the provider and consumer of the

used service.

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Red Hat SATELLITE 5.3.0 RELEASE NOTES Informacje Techniczne Strona 7