Instead of obtaining desktop and server licenses for software products it uses, an enterprise can obtain the same functions through a hosted service from a provider through a network connection. This common cloud-computing model is known as Software as a Service (SaaS), the provider is known as the SaaS Provider. These applications could be in ERP, VCC to name a few.
Platform as a Service (PaaS) provides a software platform on which users can build their own applications and host them on the PaaS provider’s infrastructure. The software platform is used as a development framework to build, debug, and deploy applications. It often provides middleware-style services such as database and component services for use by applications.
Amazon is arguably the first major proponent of Infrastructure as a Service (IaaS) through its Elastic Computing Cloud (EC2) service. An IaaS provider offers you “raw” computing, storage, and network infrastructure so that you can load your own software, including operating systems and applications, on to this infrastructure.
We have focused on cloud service providers whose data centers are external to the users of the service (businesses or individuals). These clouds are known as public clouds—both the infrastructure and control of these clouds is with the service provider.
A variation on this scenario is the private cloud. Here, the cloud provider is responsible only for the infrastructure and not for the control. This setup is equivalent to a section of a shared data center being partitioned for use by a specific customer. The private cloud can offer SaaS, PaaS, or IaaS services, though IaaS might appear to be a more natural fit.
A hybrid cloud involves data centers storing secure and important data on the enterprise premises and less important data to be stores at a remote location in the cloud. So t is a mixture of public and private cloud that yields the most benefit.
Comparative Study Cloud Computing Traditional In-house system implementation Cloud services in the form of SaaS, Paas and IaaS 1. High CapEx 1. OpEx oriented 2. Time required to implement the system 2. Comparatively low startup cost 3. Maintenance Cost 3. Pay for what you use 4. Equipment depreciation 4. Low maintenance cost 5. Dedicated staff for 24 * 7 support 5. Scalable and secure environment 6. Under-utilized resources 6. Business companies can focus on business development, not on IT.
Expenditure By 2011 16 billion or 4% of total IT s:pending will be on cloud. By 2012, it is likely to go upto 9%. Reasons: Cost controls, Better Peak time Economy, Readily Scalable, Concentrate on the business and less on IT infrastructure. Cloud Computing
Because you invoke cloud services only when you need them, they are not permanent parts of your IT infrastructure—a significant advantage for cloud use as opposed to internal IT services. With cloud services there is no need to have dedicated resources waiting to be used, as is the case with internal services.
The resiliency of a cloud service offering can completely isolate the failure of server and storage resources from cloud users. Work is migrated to a different physical resource in the cloud with or without user awareness and intervention.
Traditional in-house business software Employees Your business Servers CRM POS ERP HRM Email VCC Hardware dependency Operating systems Databases Security patches Unpredictable costs Softwares Cloud Computing
Cloud Computing Penetration software Employees Your business Servers CRM POS ERP HRM Email VCC Hardware dependency Operating systems Databases Security patches Unpredictable costs Softwares Cloud Computing Cloud Computing
Traditional in-house business Employers Your business CRM POS ERP HRM Email VCC Softwares Cloud Computing ERP Hosted PBX Email More More 10 employees = 10 subscriptions Cloud Computing
Traditional in-house business Employers Your business CRM POS ERP HRM Email VCC Softwares Cloud Computing datacenters 10 employees = 10 subscriptions Hardware dependency Operating systems Databases Security patches Unpredictable costs Cloud Computing
Traditional in-house business Cloud Computing datacenters Hardware dependency Operating systems Databases Security patches Unpredictable costs Economies of Scale 30% to 50% less in expenditure Cloud Computing