Generally, cloud computing uses computer clusters to form data centers and deliver them to users in the form of services, so that users can purchase cloud computing resources on demand as they do with water and electricity. From this perspective, the goals of cloud computing and grid computing are very similar. However, traditional distributed computing such as cloud computing and grid computing also have obvious differences: First, cloud computing is elastic, that is, cloud computing can dynamically allocate resources according to workload size, and applications deployed on cloud computing platforms need to adapt Changes in resources, and can respond to changes; secondly, compared to grid computing that emphasizes the sharing of heterogeneous resources, cloud computing places greater emphasis on sharing of large-scale resource pools, improves resource reuse rate through sharing, and uses economies of scale to reduce Operating cost: Finally, cloud computing needs to consider economic costs, so the design of hardware devices and software platforms no longer blindly pursues high performance, but must comprehensively consider factors such as cost, availability, and reliability.
Based on the above comparison and the application background of cloud computing, the characteristics of cloud computing can be summarized as follows.
1) Flexible service. The scale of the service can be quickly scaled to automatically adapt to the dynamic changes in business load. The resources used by users are consistent with the needs of the business, avoiding service quality degradation or resource waste due to server performance overload or redundancy.
2) Resource pooling. Resources are managed in a unified manner by sharing resource pools. Using virtualization technology, resources are shared with different users, and resource placement, management, and allocation strategies are transparent to users.
3) On-demand service. Provide users with applications, data storage, infrastructure and other resources in the form of services, and can automatically allocate resources according to user needs without system administrator intervention
4) The service can be billed. Monitor user resource usage and bill services based on resource usage.
5) Ubiquitous access. Users can use various terminal devices (such as PCs, laptops, smart phones, etc.) to access cloud computing services through the Internet anytime, anywhere.
It is precisely because of the above five characteristics of cloud computing that users only need to connect to the Internet to use computer resources continuously, realizing the concept of "Internet as a computer".
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