The project design phase begins with opening the discussions into more details a
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Question
The project design phase begins with opening the discussions into more details about the project requirements. The details can cover the user interface look and feel to how each of the controls will be used and what type of permissions are applied to each user control. During this phase, it is critical for the system/network administrators and database admins to step in and contribute to these discussions. The design of these system components are important and they will have a direct effect on the performance of the product or service.
1. In this objective imagine that you are a system/network engineer and document some of the common cloud services to implement a software application product built in-house as an enterprise product that must supports 100 simultaneous users. Make sure to document why you need the cloud service for this type of enterprise solution and then document the benefits of using the cloud service for each component that you recommended.
Explanation / Answer
Ans:
cloud computing represents the converging evolution of computing infrastructure and application models for building and consuming scalable distributed solutions. As techniques for building these kinds of applications have advanced, so too have the capabilities of the infrastructure on which they run. This synergistic evolution allows the infrastructure to be provisioned and maintained largely independently of the applications that it hosts. This in turn allows applications to take advantage of supporting infrastructure services and capabilities while they focus on their specific business functionality.
Many organizations have been able to realize the joint benefits of scalable application models and supporting infrastructure internally on-premises in their own data centers. However, it is the ability to leverage an off-premises outsourced application hosting infrastructure that is behind much of the excitement around cloud computing. The infrastructure provider focuses on hardware, networking, power, cooling, and the operating environment that supports application manageability, reliability, and scalability; leaving the organization free to focus on their application's business functionality. This provides many benefits in terms of reduced capital outlay and operating costs; and increased capacity, scalability and availability.
Different cloud-hosting providers have different application model requirements. Some adopt a virtual machine approach, where the application is developed and packaged along with its operating system image and the dependent runtime frameworks. Others utilize an application model that provides higher level abstractions for data access and storage (as described later in this chapter), and for computation and communication. Still others provide higher level application models based on highly configurable applications that focus on specific vertical application functionality, such as Enterprise Resource Planning (ERP) or Customer Relationship Management (CRM). Each of these approaches provides distinct advantages and disadvantages.
Furthermore, some off-premises hosted applications are self-contained and designed for users who interact with the application through a dedicated UI. Some of these applications are service-enabled, and provide both a UI and expose their functionality through an API (often exposed through standards such as REST or SOAP) so that they can be integrated into other applications, which themselves can be hosted either on-premises or off-premises. Some off-premises hosted services are specifically designed to provide functionality for integration into other applications, and provide no UI at all.
Cloud-based services generally fall into categories such as storage/compute, business services, and retail/wholesale services. Some common examples of these remote services are:
These remote services can be consumed by software that runs on-premises, in an organization's data center or on a user's machine, which may be a desktop computer or any other Internet-enabled device.
Benefits
Benefits for Enterprise Service Consumers
Design Issues
Several common issues are of concern to both ISVs and enterprise customers. While they cover a range of different aspects of hosted and cloud-based scenarios, these issues can be categorized into specific areas. Consider the following as your develop your strategy for hosted and cloud-based services:
Performance
Cloud-hosted applications must be scalable to support increasing numbers of services, and increasing load for each service and tenant. When designing services, consider the following guidelines for scaling applications:
Data Isolation and Sharing
Hosters can implement isolation and sharing for databases and for database schemas. There are three basic models:
Data Security
Cloud-hosted applications must implement strong security, using multiple defense levels that complement one another to provide data protection in different ways, under different circumstances, and against both internal and external threats. When planning a security strategy, consider the following guidelines:
Data Storage and Extensibility
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