Private vs Public Cloud Computing Pros and Cons
Cloud Computing Basics
As an alternate to the 3 tiered classification of cloud based services – Infrastructure as a Service (IaaS), Platform as a Service (PaaS) and Software as a Service (SaaS) – cloud computing may be classified primarily based upon how the underlying networks implemented and accessed by the client. The article will provides a summary of the two principle models Public and private Clouds.
These models don’t describe strict architectures so a range of configurations is utilized to realize every model of cloud computing. What is more, every model is wants to provide each tier of cloud service as mentioned on top of the article.
When the general public think about cloud computing they think about a typical public cloud model wherever the services on provide area unit offered to public customers through a public network, occasionally internet. The accessibility of this model permits for cloud services to be provided to a mass market and for the supplier to centralise/pool (and share) the physical computing resource they need to supply the services; utilising virtualisation wherever they have to determine operative environments. As a result, customers and suppliers of public cloud services will have the benefit of right smart economies of scale to cut back their prices still as sheer scalability to retort to fluctuations in demand.
Public cloud services will usually be free to the client, funded as an example by advertising, but wherever a charge is applied they typically follow a pay as you go (PAYG) kind model – that’s the consumer is provided with the computing resource they need and the providers charged them accordingly. Several of the cloud services those are most familiar to the general consumer, significantly Software as a Service (SaaS) applications like Google Docs (cloud primarily based ‘office’ applications), Gmail (web primarily based email) or Dropbox (cloud storage), fall into the general public cloud model.
For some consumers, the mechanisms of the public cloud that bring such cost savings and widespread accessibility may bring unwanted security vulnerabilities. Though the protection of those services is usually improving as I write / day by day, the actual fact that knowledge is transferred across public networks and stored on shared physical and/or virtual servers might offer obstacles to some clients with sensitive knowledge / Data. So instead of using Public cloud they could look towards to non-public cloud services i.e. Private cloud for the safety of their data.
Cloud clients who area handling, processing or storing sensitive knowledge / data that they need ensure remains private and secure and who wants to take advantage some of the cost, availability and scalability benefits that cloud computing usually offers, can utilise private cloud services as an alternative to the public cloud.
The thought or definition of a private cloud is harder to explain as no such definition exists. it’s best to categorize private clouds by a number of the features that they provide and therefore the problems that they address compared to public services, like knowledge security and ownership control (of servers etc), rather than the mechanisms they use. They will of course also display the tell-tale features of cloud computing in general – virtualisation, instantaneous scalability, PAYG charging and automated allocation of resources on demand.
The entirety of a private cloud will only be accessible by a single organisation (in contrast to multiple clients using services within the public cloud) and some examples therefore also allow the end user organisation to have control over the management of the cloud network and its set-up so that they can tailor it to their own needs. The flip side of this control however is that some of the cost savings generated by the centralised management of public cloud services will be lost in private clouds. Instead the service becomes closer in structure to a traditional local network based service, but with the benefits of virtualisation mentioned above.
The network of servers itself can be hosted internally by the organisation (as required by some regulatory bodies for sensitive data) or externally by a cloud provider (e.g., a Virtual Data Centre, VDC ) but access will be restricted to connections made behind the organisation’s firewall. To provide the security and control private clouds can employ certain characteristics techniques including closed networks of servers (not shared between clients), hosting of servers on site and leased lines to access these networks where they are hosted off site.
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