As we know keeping up with data growth is the top challenge of IT managers. In today's Internet Era, the emphasis is on cost-effectively managing multiple peta bytes of storage and a more stringent compliance landscape. Traditional networked storage technologies alone are no longer able to scale and perform at the demanding levels needed to keep pace with punishing data growth rates and requirements using existing budgets and resources. More data storage usually means additional CAPEX for infrastructure and floor space. In turn, operating OPEX climb between four and eight dollars for every dollar spent on capital equipment for: power and cooling, the administrative cycles to manage aging systems and manual processes; and time-consuming backup, recovery, migration and upgrades. So in a nut shell keeping up with data growth will be the top challenge of both mid-market and enterprise IT managers in the next two years.1 Data held in content depots, large repositories of digital content amassed and organized for information sharing or distribution, are consuming disk storage space in rapid volume.
three main cloud models: private, hybrid and public. Each model may offer varying levels of security, services, access, SLAs and value to end users.
In a private cloud, all components reside within the firewall of an organization. The infrastructure is either managed internally by the IT department and is deployed to create an agile data center or may be managed and delivered as a service by a cloud provider. Behind the security of the firewall, private cloud embraces high levels of automation to virtualize the infrastructure, including servers, networks and storage, and to deliver services to business units or other branches. With private cloud, security of the data and physical premises are determined and monitored by the IT team, and its high quality service level agreements remain intact. The organization maintains its own strong security practices of both the data and the physical location, such as key codes, passwords etc. Access to data is determined internally and may resemble existing role-based access controls or grant separate administration and data permissions based on data types and security practices. The values of private cloud to the end user are quick and easy resource sharing, rapid deployment, self service and the ability to perform ROI. The value to the service provider, or in this case,
the organization, is an ability to initiate for usage while maintaining control over data access and security.
The hybrid cloud model consists of a combination of internal and external cloud infrastructures whereby selected data, infrastructure or applications are allowed to "punch through" the corporate firewall and be provided by a trusted cloud provider. Here, the multitenant infrastructure outside the firewall delivered by a trusted cloud provider is leveraged for further cost reduction. The subscriber and the hybrid cloud provider are bound together by standardized or proprietary technologies that enable data and application portability. The IT organization makes decisions regarding what types of services and data can live outside the firewall to be managed by a trusted third-party partner
With Hybrid cloud usually provides an attractive alternative to the enterprise when internal processes can no longer be optimized: for example, when the organization's cost infrastructure can only be amortized across business units or a small customer base. By moving certain data and applications to a hybrid cloud, the enterprise is able to significantly reduce the costs of providing services by taking advantage of the multitenant capabilities and economies of scale.
In a public cloud model, all major components are outside the enterprise firewall, located in a multitenant infrastructure. Applications and storage are made available over the Internet via secured IP, and can be free or offered at a pay-per-usage fee paid with credit cards. This type of cloud supplies easy-to-use consumer-type services, such as: Amazon and Google on-demand web applications or capacity; Yahoo mail; and Facebook or LinkedIn social media providing free storage for photographs. The elasticity, low entry costs and ease of use of public cloud seem well suited to supporting applications that follow web design, service oriented architecture or virtual server environments. While public clouds are inexpensive and scale to meet needs, they typically provide "consumer level" or lower SLAs and may not offer the guarantees against data loss or corruption found with private or hybrid cloud offerings. Public cloud is appropriate for consumers and entities not requiring the same levels of service that are expected within the firewall.Also, the public clouds do not provide for restrictions and compliance with privacy laws, which remain the responsibility of end user.
Now priority wise for private clouds, the service delivery layer sits on top of enterprise IT infrastructure. In hybrid or public clouds, the enterprise's existing infrastructure can be used efficiently for core data, freed up or retired as needed. As a result, less infrastructure equates to lower data center power, cooling, facility and maintenance costs.
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