17-11-2012, 04:02 PM
Cloud computing Availability: Multi-clouds for Big data Service
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Introduction
Cloud computing, a newly developed operating paradigm, has been encouraged for
enhancing the security as IT technology develops. Although this is widely spread with
mobile office lately, the Cloud computing still has lots of spaces to improve in policy
and security. As a solution for these, cloud has been considerably discussed.
Especially, since personal mobile devices have been popular enough to carry on
during working period, known as BYOD (bring your own device), the necessity of
cloud is much emphasized. The gradual increase in using smart devices reached the
point where we have to consider more about the users who are as many as the security
problem occurred in order to offer the service efficiently. When firms accept the
cloud and put into a service, the general structure would start out with the form of
IaaS (Infrastructure as a service) and later transform into PaaS (Platform as a service).
In case of certain occasions like election or examination, the demand of service
rapidly increases which leads to a lack of resources such as memory, server, and
network. For this particular circumstance, even the cloud does not have control over
on expanding capacity and infrastructure. Furthermore, installing more capacity and
establishing additional devices prior to the emergency might cause problems like the
ones that single cloud used to have from original single server. To solve the problems
mentioned above, this paper suggests solution by connecting to another cloud. End users access cloud based applications through a web browser or a light
weight desktop or mobile app while the business software and data are stored on
servers at a remote location. Cloud application providers strive to give the same or
better service and performance than if the software programs were installed locally on
end-user computers. At the foundation of cloud computing is the broader concept of
infrastructure convergence and shared services. This type of data centre environment
allows enterprises to get their applications up and running faster, with easier
manageability and less maintenance, and enables IT to more rapidly adjust IT
resources (such as servers, storage, and networking) to meet fluctuating and
unpredictable business demand [1] The cloud computing model consists of five
characteristics, three delivery models, and four deployment models [2]. The five key
characteristics of cloud computing are: location-independent resource pooling, ondemand
self-service, rapid elasticity, broad network access, and measured service [3].
These five characteristics represent the first layer in the cloud environment. The three
key cloud delivery models are infrastructure as a service (IaaS), platform as a service
(PaaS), and software as a service (SaaS).
Conclusion
In this study, the model to increase availability of cloud computing has been
studied and its architectural structure has been suggested. To remedy the availability
problem of single cloud, modeling and architecture of "rain clouds", a system of multi
clouds, has been constructed and suggested. Once again, "Rain clouds" is a service
necessary in emergency situations. Rain clouds are linked SLA with various public
clouds that allow them to receive prior services. With SLA, rain clouds solve
problems when single cloud cannot process properly due to overload from certain
occasions. It is difficult to expand infrastructure and system in every emergency case
since cloud is not 'the supreme solution' to settle every IT resource problems.
Therefore, rain clouds become a general substitution plan for these conditions.
Implementation of private cloud system is mounting with rapidity. Further studies
on the ways to securely obtain additional resources and availability is necessary, for
there are going to be condition where private clouds will have similar problems stated
above. Security problems must be regarded with more priority and thus for further
increase in usage of this system, additional measures are ought to be taken to secure
safety.