Concepts and Models: Cloud Computing Architectures

Running head: CONCEPTS AND MODELS
ASESSMENT ITEM 2: CONCEPTS AND MODELS
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CONCEPTS AND MODELS 2
Table of Contents
Executive Summary.........................................................................................................................3
Introduction......................................................................................................................................3
Part one: Initial Webserver trial.......................................................................................................4
How selected DTGOV webservers will work in an IaaS instance..............................................4
Types of cloud architectures that can be useful for DTGOV......................................................6
Part two: Office 365.........................................................................................................................6
Benefits for Office 365................................................................................................................6
Issues related to office 365...........................................................................................................7
How cloud-based approach differs from providing office 365 from an on-premise data Centre 8
Part three: SharePoint......................................................................................................................8
The major difference between IaaS, PaaS, and SaaS...................................................................8
The best model that is appropriate for Sharepoint service...........................................................9
Some of the issues with PaaS.......................................................................................................9
References......................................................................................................................................10

CONCEPTS AND MODELS 3
Executive Summary
DTGOV was created by the ministry of social security. During the creating of company,
the organization had about one thousand employees and about 60 branches which were
operational. Currently, the company have about three thousand employees with branches in three
hundred localities. In addition, the company has 3 data centers running both Intel x86 –platform
and mainframe. The company has a lot of customers who require meaning that the company
needs to move to clould computing environment. One of the reasons as to why DTGOV needs to
move to cloud computing is so as to reduce operational costs, to establish a disaster recovery
system and to reduce network traffic. This paper focus on various aspects of cloud computing
architectures.
Introduction
DTGOV is a company which wants to migrate some of its Webservers to IaaS instance.
The company provides autonomous management structure with significant flexibility to evolve
its IT enterprise. The organization understands that they do not need to do a full migration plan
first, as they want to examine what sort of architecture is required to support their web services
(Rountree & Castrillo, 2015). This paper will seek to address several questions in regards to
DTGOV case study. One of the questions this paper will address is how the selected DTGOV
servers will work in IaaS environment and the organization will benefit from these. Another
question which will be addressed are the types of cloud architectures which would be useful for
DTGOV. To address all the questions, the paper will have three parts which are initial webserver
trial, office 365, and Sharepoint.

CONCEPTS AND MODELS 4
Part one: Initial Webserver trial
How selected DTGOV webservers will work in an IaaS instance
To start with IaaS is one of the cloud computing platform. IaaS platform provides
webservers, application servers, messaging services, and operating system. DTGOV servers will
work in the same way as on-premise. Nevertheless, AWS will own the responsibility of the
management of the entire service and infrastructure for a continuous operation via hosted
webservers. AWS will support accessibility, scalability, and high availability of the services for
24 hours using internet connection (Mahmood, 2011).
Once DTGOV webservers migrate to IaaS instance, the IaaS environment will contain
hosted virtual servers which will be instantiated on physical servers running on physical servers
that run the same hypervisor software which controls the virtual servers. The VIM is used to
coordinate physical servers in relation to the creation of virtual server instances. Figure one
below depicts virtual servers running over physical servers all of which are controlled by the
central VIM (Ruparelia, 2017).