Question

literature revie on hybrid cloud with IEEE references.

please do it nicely and dnt copy

thanks

Answer 1

Hybrid Cloud — The cloud infrastructure consists of a number of clouds of any type, but the clouds have the ability through their interfaces to allow data and/or applications to be moved from one cloud to another. This can be a combination of private and public clouds that support the requirement to retain some data in an organization, and also the need to offer services in the cloud.

Some of the characteristics of hybrid clouds are:

1) Optimal utilization: The available server resources in typical data centers are actually used from 5-20%. This is because of peak loads which are ten times higher than that of the average load. Hence, servers are mostly idle - generating unnecessary costs. Hybrid clouds can increase server utilization by scaling out to public resources to handle crowds.

2) Data centre consolidation: Instead of providing the capacity to cope for worst-case scenarios, a private cloud only needs resources in average cases. The option to burst out allows server consolidation and hence resulting in reduction of operating costs. In particular, this includes the costs for hardware, power, cooling, maintenance, and administration.

3) Risk transfer: The companies themselves are responsible for keeping up and running their data centre and private cloud. The public cloud provider has to ensure a high uptime for their service. Using a hybrid cloud model, “the risk of misestimating workload is shifted to the cloud vendor from the service operator”. Most of the cloud providers have service level agreements which ensure an uptime of more than 99.9% per year, i.e., a downtime of max. 9 hours per year.

4) Availability: The high availability in the corporate data centre is difficult and expensive, because it requires redundancy, backups, and geographic dissemination. Especially in companies where IT is not the core business, the expertise in this area is rather limited. In a hybrid cloud environment, the public cloud can scale up or take over operations completely if the company’s data centre is unavailable due to failures or Distributed Denial of Service (DDoS) attacks.

The attributes of Hybrid Cloud are:

1) Service Based: Consumer concerns are abstracted from provider concerns through service interfaces that are well-defined. The interfaces hide the implementation details and enable a completely automated response by the provider of the service to the consumer of the service.

2) Scalable and Elastic: The service can scale capacity up or down as the consumer demands at the speed of full automation (which may be seconds for some services and hours for others). Elasticity is a trait of shared pools of resources.

3) Shared: Services share a pool of resources to build economies of scale. IT resources are used with maximum efficiency. The underlying infrastructure, software or platforms are shared among the consumers of the service (usually unknown to the consumers). This enables unused resources to serve multiple needs for multiple consumers, all working at the same time.

4) Metered by Use: Services are tracked with usage metrics to enable multiple payment models. The service provider has a usage accounting model for measuring the use of the services, which could then be used to create different pricing plans and models. These may include pay-as-yougo plans, subscriptions, fixed plans and even free plans. The implied payment plans will be based on usage, not on the cost of the equipment.

5)Uses Internet Technologies: The service is delivered using Internet identifiers, formats and protocols, such as URLs, HTTP, IP and representational state transfer Web-oriented architect.