Where does the computing power of cloud computing come from

1. Cloud computing is a mode of increasing, using and delivering related services based on the Internet. It usually involves providing dynamic, scalable and often virtualized resources through the Internet. Cloud is a metaphor of network and Internet. In the past, cloud was often used to represent telecom network, and later it was also used to represent the abstraction of Internet and underlying infrastructure. Therefore, cloud computing can even let you experience the computing power of 10 trillion times per second. With such powerful computing power, you can simulate nuclear explosions, predict climate change and market trends. Users access the data center through computers, laptops, mobile phones and other ways, and calculate according to their own needs
there are many definitions of cloud computing. There are at least 100 explanations for what cloud computing is. What is widely accepted at this stage is the definition of National Institute of standards and Technology (NIST): cloud computing is a pay per use mode, which provides available, convenient and on-demand network access, and enters the configurable computing resource sharing pool (resources include network, server, storage, application software and services). These resources can be quickly provided, It requires little management or interaction with service providers<

features
cloud computing makes computing distributed on a large number of distributed computers instead of local computers or remote servers. The operation of enterprise data center will be more similar to that of Internet. This enables enterprises to switch resources to the applications they need, and access computers and storage systems according to their needs
it is like changing from the old single generator mode to the centralized power supply mode of power plant. It means that computing power can also be circulated as a commodity, just like gas, water and electricity, which is easy to use and low-cost. The biggest difference is that it is transmitted through the Internet< The characteristics of cloud computing that are generally accepted are as follows:
(1) super large scale
"cloud" has a considerable scale. Google cloud computing has more than 1 million servers, and Amazon, IBM, Microsoft, Yahoo and other "cloud" have hundreds of thousands of servers. Enterprise private cloud generally has hundreds of thousands of servers“ "Cloud" can give users unprecedented computing power
(2) virtualization
Cloud Computing supports users to obtain application services at any location and using various terminals. The requested resources come from the "cloud" rather than a fixed tangible entity. The application runs somewhere in the "cloud", but actually users don't need to know and worry about the specific location of the application. Just need a laptop or a mobile phone, we can achieve everything we need through network services, even including tasks such as supercomputing
(3) high reliability
"cloud" uses fault tolerance of multiple copies of data, isomorphism and interchangeability of computing nodes to ensure high reliability of services. Cloud computing is more reliable than local computer
(4) generality
cloud computing is not specific to specific applications. It can construct a variety of applications under the support of "cloud", and the same "cloud" can support different applications running at the same time
(5) high scalability
"cloud" scale can be dynamically scaled to meet the needs of application and user scale growth
(6) on demand service
"cloud" is a huge resource pool, which you can buy on demand; Clouds can be charged like water, electricity and gas
(7) extremely cheap
e to the special fault-tolerant measures of "cloud", extremely cheap nodes can be used to form the cloud. The automatic centralized management of "cloud" enables a large number of enterprises not to bear the increasingly high cost of data center management. The universality of "cloud" greatly improves the utilization rate of resources compared with traditional systems, so users can fully enjoy the low-cost advantage of "cloud", It often takes only a few hundred dollars and a few days to complete tasks that used to take tens of thousands of dollars and a few months
cloud computing can completely change people's future life, but at the same time, we should also pay attention to environmental issues, so as to truly contribute to human progress, rather than simple technology upgrading
(8) potential danger
cloud computing services not only provide computing services, but also storage services. However, cloud computing services are currently monopolized in the hands of private institutions (enterprises), and they can only provide commercial credit. Government agencies and commercial organizations (especially those holding sensitive data such as banks) should be vigilant in choosing cloud computing services. Once commercial users use the cloud computing services provided by private organizations on a large scale, no matter how strong their technological advantages are, they will inevitably let these private organizations threaten the whole society with the importance of "data (information)". For the information society, "information" is crucial. On the other hand, the data in cloud computing is confidential for users other than the data owner, but there is no secret for the commercial organizations providing cloud computing. All these potential risks are an important premise that commercial institutions and government agencies have to consider when choosing cloud computing services, especially those provided by foreign institutions.

3. 1 Principle:

cloud computing is the development of distributed computing, parallel computing and grid computing, or the commercial realization of these computer science concepts

the basic principle of cloud computing is that by making the computing distributed on a large number of distributed computers instead of local computers or remote servers, the operation of enterprise data center will be more similar to the Internet. This enables enterprises to switch resources to the applications they need, and access computers and storage systems according to their needs

this is a revolutionary measure. For example, it is like changing from the old single generator mode to the centralized power supply mode of power plant. It means that computing power can also be circulated as a commodity, just like gas, water and electricity, which is easy to use and low-cost. The biggest difference is that it is transmitted through the Internet

the blueprint of cloud computing is ready: in the future, we can achieve everything we need through network services, even tasks such as supercomputing, with only a laptop or a mobile phone. From this point of view, the end user is the real owner of cloud computing

the application of cloud computing includes the idea of uniting forces for each member< At present, PC is still the core tool in our daily work and life. We use PC to process documents, store data, and share information with others through e-mail or USB flash disk. If the PC hard disk is broken, we will be helpless because of the loss of data

in the "cloud computing" era, "cloud" will do the work of storage and computing for us“ "Cloud" is a group of computers, each group includes hundreds of thousands, even millions of computers“ The advantage of "cloud" is that the computer can be updated at any time to ensure that "cloud" is immortal. Google has several such "clouds", and other IT giants, such as Microsoft, Yahoo and Amazon, have or are building such "clouds"

at that time, we only need a computer that can access the Internet, and we don't need to care which "cloud" the storage or computing takes place in. However, once we need it, we can quickly calculate and find the data from any place with any device, such as computer, mobile phone, etc. We don't have to worry about data loss anymore< (3) several forms of cloud computing

1. SaaS (software as a service)

this type of cloud computing transmits programs to thousands of users through browsers. In the eyes of users, this will save the cost of server and software licensing; From the supplier's point of view, this only needs to maintain a process, which can rece costs. Salesforce.com is by far the most famous company for such services. SaaS is commonly used in human resource management program and ERP. Google Apps and Zoho office are similar services

2. Utility computing

this idea has been around for a long time, but it's only recently that it's been born in amazon.com, sun, IBM and other companies that provide storage services and virtual servers. This kind of cloud computing is to create a virtual data center for the IT instry, so that it can integrate memory, I / O devices, storage and computing power into a virtual resource pool to provide services for the whole network

3. Network services are closely related to SaaS. Network service providers can provide APIs to enable developers to develop more Internet-based applications instead of providing stand-alone programs

4. Platform as a service is another kind of SaaS, which provides the development environment as a service. You can use the middleman's device to develop your own programs and send them to users through the Internet and its servers< 5. MSP is one of the oldest cloud computing applications. This kind of application is more for IT instry than for end users, and is often used for email virus scanning, program monitoring and so on< This kind of cloud computing provides a platform for the interaction between users and providers. For example, the user's personal expense management system can manage the user's expenses according to the user's settings and coordinate the various services they order

7. Internet integration integrates companies providing similar services on the Internet, so that users can more easily compare and choose their own service providers< br /> http://ke..com/view/1316082.html?wtp=tt

4.

Cloud computing is not a new network technology, but a new network application concept. The core concept of cloud computing is to provide fast and secure cloud computing services and data storage on the website with the Internet as the center, so that everyone who uses the Internet can use the huge computing resources and data center on the network

cloud computing is a new innovation in the information age after the Internet and computer. Cloud computing is a big leap in the information age, and the future era may be the era of cloud computing

but generally speaking, the basic meaning of cloud computing is consistent, that is, cloud computing has strong scalability and needs, and can provide users with a new experience. The core of cloud computing is to coordinate a lot of computer resources together, so that users can obtain unlimited resources through the network, The resources obtained at the same time are not limited by time and space

In general, its service types are divided into three categories, namely infrastructure as a service (IAAs), platform as a service (PAAS) and software as a service (SaaS). These three kinds of cloud computing services are sometimes called cloud computing stack, because they build the stack, and they are located on top of each other. The following is an overview of these three kinds of services:

1, infrastructure as a service (IAAs)

infrastructure as a service is one of the main service categories, which provides virtualization computing resources to indivials or organizations of cloud computing providers, such as virtual machine, storage, cloud computing and so on Network and operating system

2. Platform as a service (PAAS)

platform as a service category provides developers with a platform to build applications and services through the global Internet. PAAS provides an on-demand development environment for developing, testing and managing software applications

3. Software as a service (SaaS)

SaaS is also one of its services. It provides software paid applications on demand through the Internet, and cloud computing providers host and manage software applications, and allow their users to connect to applications and access applications through the global Internet

source: network cloud computing