Cloud Computing
What is cloud Computing?
Cloud computing is defined as a type of computing that relies on sharing computing resources rather
than having local servers or personal devices to
handle applications. Cloud
computing is comparable to grid computing, a
type of computing where unused processing cycles of all computers in a network
are harnesses to solve problems too intensive for any stand-alone machine.
Cloud computing, also known as 'on-demand computing', is a kind of Internet-based
computing, where shared resources, data and information are provided to
computers and other devices on-demand. It is a model for enabling ubiquitous,
on-demand access to a shared pool of configurable computing resources.Cloud
computing and storage solutions provide users and enterprises with various
capabilities to store and process their data in third-party data centers. It relies on sharing of resources to
achieve coherence and economies of scale, similar to a utility (like the electricity grid)
over a network. At the foundation
of cloud computing is the broader concept of converged infrastructure and shared services
Cloud computing is 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.
Cloud computing, or in simpler shorthand just "the
cloud", also focuses on maximizing the effectiveness of the shared
resources. Cloud resources are usually not only shared by multiple users but
are also dynamically reallocated per demand. This can work for allocating
resources to users. For example, a cloud computer facility that serves European
users during European business hours with a specific application (e.g., email)
may reallocate the same resources to serve North American users during North
America's business hours with a different application (e.g., a web server).
This approach helps maximize the use of computing power while reducing the
overall cost of resources by using less power, air conditioning, rack space,
etc. to maintain the system. With cloud computing, multiple users can access a
single server to retrieve and update their data without purchasing licenses for
different applications.
The term "moving to cloud" also refers to an organization
moving away from a traditional CAPEX model
(buy the dedicated hardware and depreciate it over a period of time) to the OPEX model (use a shared cloud infrastructure
and pay as one uses it)
Proponents claim that cloud computing allows companies to avoid
upfront infrastructure costs, and focus on projects that differentiate their
businesses instead of on infrastructure. Proponents
also claim that cloud computing allows enterprises to get their applications up
and running faster, with improved manageability and less maintenance, and
enables IT to more rapidly adjust resources to meet fluctuating and unpredictable
business demand.Cloud providers typically use a "pay as you go"
model. This can lead to unexpectedly high charges if administrators do not
adapt to the cloud pricing model.
The present availability of high-capacity networks, low-cost
computers and storage devices as well as the widespread adoption of hardware virtualization, service-oriented architecture, and autonomic and
utility computing have led to a growth in cloud computing. Companies can scale up as computing
needs increase and then scale down again as demands decrease.
Cloud computing has now become a highly demanded service or utility
due to the advantages of high computing power, cheap cost of services, high
performance, scalability, accessibility as well as availability. Cloud vendors
are experiencing growth rates of 50% per annum.But due to being in a stage of
infancy, it still has some pitfalls which need to be given proper attention to
make cloud computing services more reliable and user friendly.
In cloud computing,
the word cloud (also
phrased as "the cloud") is used as a metaphor for "the Internet," so the
phrase cloud computing means
"a type of Internet-based computing," where different services — such as servers, storage and applications —are delivered to an organization's computers and devices
through the Internet.
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