mmm Now, as developers, we should know the layers of cloud. Cloud computing consists of three layers: Infrastructure as a service (Iaas), Platform as a service(Paas) & Software as a service( Saas) ... ok , lets know what are these layers ?
In IaaS, cpu, grids or
clusters, virtualized servers, memory, networks, storage and systems software
are delivered as a service.
PaaS provides
virtualized servers on which users can run applications, or develop new ones,
without having to worry about maintaining the operating systems, server
hardware, load balancing or computing capacity. Well known examples include
Microsoft’s Azure
SaaS is software that
is developed and hosted by the SaaS vendor and which the end user accesses over
the Internet.
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There is an important thing we should all know :
&& Cloud computing is a concept not a technology &&
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Lets see what have been said about cloud computing :
Cloud computing is :
“Moving computing and data away from desktop & portable PC and simply displaying the results of computing that takes place in a centralized location and is then transmitted via the internet to the user’s screen.” John Markoff – a Journalist.
“The trend towards online services that runs in a web browser and store user’s information in a provider’s data center.” Workshop Announcement
“A computer paradigm shift where computing is moved away from personal computer or an individual application server to a cloud of computers.” Wikipedia.
“The idea of relying on the web-based applications and storing data in the cloud of the internet.” MIT Technology Review.
“We’re all in” Steve Ballmer talking about cloud computing– Microsoft CEO
copied
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wait for part 3 ( introduction to windows Azure )
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