Weak current College】 【cloud computing's origins, concepts and applications.

<br> Now the most popular cloud computing (CloudComputing)? and grid computing (GridComputing)? mail security and management products supplier Cellopoint explains cloud computing concept of origin, as well as the relevant application form. <br> <br> Cloud computing .in the last few years is fired before the fiery, members may also heard another noun-grid operation; many people find that grid computing with cloud computing is similar, in fact, both conceptually and not very strict, can be regarded as a distributed computing .(DistributedComputing) Hin-out concept. <br> <br> Grid computing cloud computing vs. <br> <br> Grid computing (GridComputing) is through the use of a large number of different computers (usually desktop Desktop) of unused resources .(CPU and disk storage space), it becomes a virtual cluster of calculator, to address the problem of mass calculation provides a schema. Grid Computing's focus on supporting cross-domain operations, the use of parallel operations, focused on enterprise or cross-enterprise .resources to good use, problems of computing tasks. <br> <br> Cloud computing (CloudComputing) is a dynamic way to extend the capabilities of the operation, the most basic concept is to be a computer operations work (Task) is divided into .a number of programs (Process), through distribution to Internet server groups (cloud hosts) processing and analysis, and then apply the result back to the client. Although cloud computing from parallel computing technology, not out of grid computing concepts, but cloud computing .more focused in data processing. <br> <br> Mainstream cloud technology <br> <br> • Google MapReduce: is in cloud computing in key technologies, so that developers can create large amounts of data processing procedures. First through the Map program .data cut into chunks that are not related to a large number of computer processing, and Reduce the program will summarize the results, and output the results of the developer's needs. <br> <br> • Hadoop: Hadoop is Google cloud framework be inspired .to start of open source projects, Hadoop framework is published by Google's BigTable and GoogleFileSystem concept proposed by such article is done, written in java, you can provide large amounts of data in a distributed computing environment, but the distributed file system and Google. Yahoo .is the most important contributors and users. <br> <br> Cloud computing service mode <br> <br> Cloud computing applications usually virtual type, information technology, including computing, storage and bandwidth for the services, provided to the customer via the .Internet. Adoption of cloud computing, users as long as a service as a black box (BlackBox), enter the action you want to do, do not need to know how to operate in a black box, as long as the result of feedback, .such as processing. Category in accordance with the service can be divided into the following three modes: <br> <br> 1. software as a service (SoftwareasaService, SaaS)-are made through Internet software deployment mode to provide enterprises with the selected .subscription software services (SoftwareonDemand), from the front Office applications such as Email, word processing to the back-end data analysis, customer relationship management, business process management and human resources management, etc. On behalf of the manufacturers have Google, Salesforce, .Microsoft, etc. <br> <br> 2. platform-as-a-service (PlatformasaService, PaaS)-PaaS is a service of the host platform or virtual solution collection, users do not have self-built hardware host and operating system ., network service providers provide rented PaaS hosting platform, able to eliminate hardware maintenance and management of manpower and time. With PaaS, software companies can focus on software development and accelerate the deployment of online time function, renowned companies such as Amazonwebservices and GoogleAppEngine, etc .. <br> <br> 3. the schema-as-a-service (InfrastructureasaService, IaaS)-IaaS will IT infrastructure into a service company to outsourcing of internal IT infrastructure needed by the IaaS manufacturers. Compared to the construction of the traditional .room need to order the required hardware, software, storage, power, and bandwidth costs, enterprises can more efficient access to IT resources, how much to pay. <br> <br> Enterprise private clouds (PrivateCloud) and mixed clouds (HybridCloud) .a concepts is an extension of IaaS. Private cloud to outsource VPN way into internal resources; mixed clouds are combined with public cloud (PublicCloud / SaaS) and private cloud, a more flexible to different vendors integrate of cloud services, sensitive data to the private .cloud for service, non-confidential information is dealt with by the public at lower costs. <br> <br> More and more manufacturers into the cloud services, said cloud services market has become the future trend, the rise of market represents the enterprise .organization can reduce the construction cost information service, will focus on core operations, enhance efficiency and competitiveness. But the popularity of cloud services also brought many issues such as security concerns, service level (ServiceLevel) are sufficient to meet the Organization's day-to- .day job requirements, and reliability of existing system compatibility, etc. <br> <br> <br>.