In Basic terms, Cloud computing is the word used to describe different scenarios in which computing resource is delivered as a service over a network connection. Cloud computing type of computing that relies on sharing a pool of physical or virtual resources, rather than deploying local or personal hardware and software. One of the key characteristics of cloud computing is the flexibility that it offers and one of the ways that flexibility is offered is through scalability.
Many of our customers turn increasingly to virtualization when they need to add capacity or deliver new or scaled out services. Our customers want the efficiency, simplicity, and cost-effectiveness of a fully virtualized and highly automated infrastructure. Indeed, many organizations are on a declared trajectory toward a full infrastructure-as-a-service (IaaS) model enabled by their own on-premises or off-premises private cloud.
A private cloud is a particular model of cloud computing that involves a distinct and secure cloud based environment in which only the specified client can operate. As with other cloud models, private clouds will provide computing power as a service within a virtualized environment using an underlying pool of physical computing resource. However, under the private cloud model, the cloud is only accessible by a single organization providing that organization with greater control and privacy.
A private cloud depends on the flexible pooling of processor, memory, storage, networking and software resources.
Elasticity and Perception of Infinite Capacity
From customer’s perspective, cloud services should appear to have infinite capacity. End users can consume as much or as little of the service as needed, just as they consume electricity. This perception is possible because, in contrast to a reactive approach that leads to inefficient resource use, the private cloud facilitates proactive capacity planning so that the infrastructure can satisfy peak requests on demand, this principle helps achieve grater balance between the cost of unused capacity and the desire for agility.
Perception of Continuous Availability
Customer should never experience as interruption in IT services, even if failures occur within the cloud infrastructure. To achieve this continuous availability, the private cloud architecture delivers a highly automated environment in which infrastructure redundancies, such as failure clustering, are complemented by intelligent automation and management capabilities.
Both services providers and consumers require predictability from a private cloud infrastructure. For consumers, cloud services should be consistent- they should have the same quality and functionality each time they are used.
Service Provider’s Approach to IT
When business needed new or expanded IT services, they purchased the necessary components and then built as infrastructure specific to the services requirement. The result was often disappointing in terms of agility and also meant delays, duplicate infrastructure, increased costs, and poor utilization.
Partners can subdivide the private cloud and provision logically isolated resources to different customers. Customers can also benefit from the multitenant capabilities of an on-premises private cloud infrastructure because resources can be provisioned for distinct organization units within the business, which facilitates usage metering and chargeback.
Security and Identity
Private cloud delivers strong security for cloud computing through three pillars:
· Protected infrastructure
· Application Access
· Network access
The private cloud uses security and identity technologies to protect both physical and virtual hosts, information, and applications in the data center.
The private cloud model is closer to the more traditional model of individual local access networks used in the past by enterprise but with the added advantages of virtualization. The features and benefits of private clouds are:
Higher security and privacy
Public clouds services can implement a certain level of security but private clouds using techniques such as distinct pools of resources with access restricted to connections made from behind one organisation’s firewall, dedicated leased lines and on-site internal hosting can ensure that operations are kept out of the reach of prying eyes.
As a private cloud is only accessible by a single organization, that organization will have the ability to configure and manage it in line with their needs to achieve a tailored network solution. However, this level of control removes some the economies of scale generated in public clouds by having centralized management of the hardware.
Cost and energy efficiency
Implementing a private could model can improve the allocation of resources within an organization by ensuring that the availability of resources to individual departments/business functions can directly and flexibly respond to their demand. Therefore, although they are not as cost effective as a public cloud services due to smaller economies of scale and increased management costs, they do make more efficient use of the computing resource than traditional LANs as they minimize the investment into unused capacity. Not only does this provide a cost saving but it can reduce an organization’s carbon footprint too.
Even, where resources are hosted internally, the creation of virtualized operating environments means that the network is more resilient to individual failure across the physical infrastructure.
Private Cloud uses the classic competing axes of time, cost, and quality as a basis for articulating business drivers, but with the minor modification of replacing the term “time” with “agility,” as “agility” is a better expression of responsiveness. Good examples of business drivers are as follows:
- Reduce Time to Market: Implement new business solutions more quickly so revenue comes in faster.
- Better Enable the Solution Development Life Cycle: Speed up business solutions through better facilitation for development and testing and overall faster paths to production.
- Respond to Business Change: New requirements of existing business solutions are met more quickly.
- Reduce Operational Costs: Lower daily operational costs for basic needs such as people, power, and space.
- Reduce Capital Costs or Move to Annuity-Based Operational Costs: Reduced IT physical assets by using more pay-per-use services.
- Transparency of IT Costs: Customers are more aware of what they get for their money.
- Consistently Deliver to Better-Defined Service Levels: Leads to increased customer satisfaction.
- Provide Better Continuity of Service: Minimize service interruptions.
- Regulatory Compliance: Meeting or exceeding mandatory requirements, which may grow more complex with online services.
Private clouds on the other hand use pooled services and infrastructure stored and maintained on a private network – whether physical or virtual – accessible for only one client. The obvious benefits to this are greater levels of security and control. Cost benefits must be sacrificed to some extent though, as the enterprise in question will have to purchase/rent and maintain all the necessary software and hardware.