Between now and 2020, worldwide spending on public cloud services is expected to soar to more than $195 billion, essentially doubling the revenue the industry is expected to generate by the end of this year, according to a new report from IDC.   Hence Cloud is no more a hype or a fad. But adoption rates are uneven from industry to industry and from country to country.  Still many business don’t trust cloud because to them cloud means Public Cloud.  Hence lets first understand four models of cloud ie.

  • Private Cloud
  • Public Cloud
  • Hybrid Cloud and
  • Community Cloud

The essential difference between the Public and Private models is “Single or multi-Tenant ”, Control and Provisioning. All cloud services runs on virtualized hardware and are available over the broadband – Net.

PRIVATE CLOUD is a customized set-up that is SINGLE TENANT dedicated to a Private Cloudparticular business; Control rests with the client.  Generally it does not have automation or self-provisioning features because control lies with the IT and they fear giving up control to the end users.  It is hosted at the clients place or may be hosted at a services provider’s data center.  Since control and security lies with the client it is an ideal choice for financial institutions, government bodies and hosting red tape applications for enterprise.

PROS: Yields similar benefits as public clouds; Services available on demand; Can act as a gateway to the public cloud; Keeps business-critical information systems inside

CONS: Doesn’t have the elasticity of public clouds; Limited scale and flexibility; Requires significant investment; Obsolescence risk is still a worry

PUBLIC CLOUD: is MULTI –TENANT wherein Control rests with the service e provider.  It  has automation, self-provisioning and scalability, elasticity features.  It is hosted at the Public_Cloud_2service provider’s data center. This result in reduced direct costs, and also gives IT more time to focus on revenue-generating projects such as mobile apps, improved customer portals, and similar work.  The size of the public cloud means a company can scale capacity and computing power either up or down in just minutes, in congruence with business needs.  Its an ideal platform to host customers facing applications and or Big Data, IOT and Mobility wherein Cloud services are  not limited by time, geography, technical support and capacity provisioning.

EXAMPLES:  Salesforce.com, Google Apps, Amazon and Cisco HCS

PROS: Pricing/Move from Capex to Opex; Services available on demand – agility; Reduced Risk; Evergreen Experience

CONS: Information security; Systems Reliability; Loss of Transparency & control Retro fitting business applications.                                                                                                          

HYBRID CLOUD: Combo of Private and Public Cloud. Typically used for migration and bursting or a simply a mix of the two cloud types.  The hybrid cloud is increasingly the Hybrid_cloud0path for organizations that desire a customizable approach with reduced maintenance costs and time. Pursuing a hybrid approach is often the path IT will take to convince upper management that the cloud is safe and a good option for critical data. They can test a tier of data or applications in the public cloud while keeping the bulk of their infrastructure in a private environment. 

PROS: The best of both worlds, access to innovative and on-demand services in the public cloud with the management control of a private one.

CONS: Only now being implemented

COMMUNITY CLOUD: The cloud infrastructure is shared by several organizations and supports a specific community that has shared concerns (e.g., mission, security Community _Cloudrequirements, policy, and compliance considerations). It may be managed by the organizations or a third party and may exist on premise or off premise.

PROS: Higher level of security/privacy; higher level of compliance

CONS: May be expensive