My Article to FOSSUser - "Ubuntu on Cloud" Part 3

Private cloud again the Wikipedia says, Private cloud is infrastructure operated solely for a single organization, whether managed internally or by a third-party and hosted internally or externally.
Many large organizations either prefer or forced by the laws and regulations to take private cloud model on their hand for some several important reasons. Unlike the pay-as-you-go model of public clouds, on the other hand, private clouds require significant up-front development costs, data centre costs, ongoing maintenance, hardware, software and internal expertise.

Let we compare both deployment models with their pros and cons.

Features	Private Cloud	Public Cloud
Cost	Very much expensive.	Cheap, when comparing with private.
User access	Restrictions can be enforced.	Not strict regulations enforced.
Customization	Can be done, because you own the Hardware and HaaS related stuffs.	Very few customizations are available.
User tools	User tools are available because it is your own cloud.	Very few. Not tailored to fit an organization’s requirement.
Commitments	Long time or Organization’s commitment level.	Short time or temporary commitments.
Flexibility	Less flexibility because the hardware is dedicated to one organization.	High, comparing with Private, Public is a mass approach.
Security	Can be secured to meet compliance of almost every level.	Security might not meet the enterprise compliance standards.

Community clouds are used by distinct groups or communities (Universities, Charity Clubs, Sports Clubs) of organizations that have shared concerns such as compliance or security considerations, and the computing infrastructures may be provided by internal or third-party suppliers. The communities benefit from public cloud capabilities but they also know who their neighbors are so they have fewer fears about security and data protection.

Figure 2

                                                                                                                                                                          

Finally the fourth deployment model is Cloud hybrids, where it talks about the combination of Public and Private Clouds. An organization can deploy public cloud for their general computing and deploy private for the data which the organization feels sensitive i.e. Customer details, Policies, Confidential reports and so on. The figure 2 below neatly expresses the text.

From the definitions we knew the advantages of Cloud Computing. but on the other hand Cloud has many challenges that it has to improve for future integration. 

           Continued in Part 4
           http://imthefortune7.blogspot.com/2012/04/my-article-to-fossuser-ubuntu-on-cloud_07.html