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This article focuses on "what are the advantages and disadvantages of cloud computing". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what are the advantages and disadvantages of cloud computing"?

For small and medium-sized enterprises, in order to develop their business, the internal IT infrastructure must always "keep up with the trend of the times" and often need to provide more resources than they currently need. Therefore, a fully functional data center is very important for most companies. However, it takes a lot of cost to set up your own data center and hire professionals to maintain it, and it is difficult to scale and adjust flexibly on demand.

With the help of cloud computing, you can use application services directly on the cloud through Internet, including storage space, processing power, database and software environment, without purchasing hardware servers.

The History of Cloud Computing

This kind of networked computer, which provides users with more processing power and storage space, is not a new invention. Mainframes in the 1950s took the first step towards cloud computing. At that time, users could access the mainframe and use its functions through multiple other terminals in the organization, although users at the time needed to calculate the time to use the mainframe.

In the decades that followed, the advent of virtualization technology allowed computer instances to be rebuilt abstractly. This virtual environment was then available to all network users and was commercially sold to more users in the 1990s. After that, the concept of cloud became more and more popular, and after 2000, many companies began to become interested in cloud technology.

Nowadays, most smartphones (or the Internet of things) are always connected to the cloud, which not only brings a lot of convenience to the company, but also becomes a part of the daily lives of many people. So what is cloud computing?

Cloud computing is a general term for hardware and software services provided through the Internet, usually with large data centers or server clusters as the center, pooling the resources of multiple computers or servers together to form grid computing to achieve high performance. It covers everything from cloud storage space provided by remote servers to infrastructure in the cloud, and combined with virtualization, a single virtual instance can be created for a single user in the network. Although cloud computing contains a lot of content, it is clearly defined whether it can be called cloud computing.

According to a paper by the National Institute of Standards and Technology, services must meet the following characteristics in order to be called cloud computing:

* * on-demand self-service: * * users should always be able to request the required resources independently without having to contact the service provider.

* * extensive network access: * * access to cloud computing from any network device anytime, anywhere.

* * Multi-person shared resource pool: * * pooling multiple computing resources is a basic requirement for cloud computing. The resource pool can dynamically allocate and reallocate resources, such as processing power and storage, to meet the needs of multiple users.

* * Rapid redeployment flexibility: * * Resource delivery must be fast and demand-based. In some cases, it can be zoomed in and out automatically without the intervention of the customer or service provider.

* * measurable services: * * always monitor the usage status of cloud services, increasing transparency for both parties.

Various types of cloud computing

Today, with the increasing number of cloud services, a variety of cloud solutions have emerged in the market. In addition to the price and support provided, the main difference between these solutions lies in the layer and deployment model provided. "layer" refers to the level of service, while the deployment model determines the type of service provided.

Service level

"layer" refers to the corresponding specific service level, which generally describes the scope of the service through various "as-a-service" levels. Therefore, pyramid models are usually used to render them. Infrastructure as a service has the largest scope, while software as a service focuses only on specific applications.

The specific coverage of these "as-a-service" is as follows:

* * Infrastructure as a Service (IaaS): * * at this level, vendors provide complete hardware solutions: computing power, storage space, and networking. The instance used by the user is completely virtual and the resource pool is divided. IaaS can be used as a basis for other layers or can be provided as a stand-alone product.

* * platform as a Service (PaaS): * * provides a complete cloud environment that is not just hardware. PaaS is mainly aimed at software developers. Service providers provide an established development environment in a cloud hosted on hardware. As a result, programmers can save time and cost in maintaining such an environment.

* * Software as a Service (SaaS): * * provides a software solution for users. SaaS is aimed primarily at typical end users who don't have to worry about installing and maintaining software and can rest assured that the hardware is powerful enough.

* * everything as a service (XaaS): * * XaaS can be assigned to different levels. Because in addition to the three tiers mentioned above, for some special reasons (such as marketing), individual providers also provide additional services XaaS. This is usually for special reasons (such as marketing). In fact, XaaS can be classified into different levels.

* * Human as a Service (HuaaS): * * is a form of crowdsourcing in which a group of people work through Internet.

Of course, the three service models we see most every day are Iaas, PaaS, and SaaS.

Deployment model

The deployment model describes the types of services, and there are four:

* * Private cloud: * * the server is only used by one customer. A private cloud can be local (internal cloud). Even if the managed program of the server cluster is used, other customers who use the program cannot access the dedicated hardware.

* * Public cloud: * * Public cloud is considered to be the main form of cloud computing, and its core attribute is shared resource service, that is, everyone shares server resources. As users, we cannot see who is using server resources and making changes.

* * Hybrid cloud: * * this model is a mixture of private cloud and public cloud. This means that users can determine which parts of their operations are made private (for example, security) and which remain public.

* * Community cloud: * * the function of community cloud is similar to that of private cloud, except that multiple users share a dedicated hardware instance. However, the user resource pool is not random and is usually grouped together by customers from the same business area or with similar interests. In addition, community clouds can be managed either internally or externally. It saves more resources than running multiple private clouds.

Advantages and disadvantages of Cloud Computing

The emergence of cloud computing provides a solution for small and medium-sized enterprises to solve the problem that self-built IT infrastructure is too expensive. The use and maintenance of the hardware is taken over by the service provider, and enterprises only need to invest in cheap terminals to access cloud computing services. In addition, professional server clusters are much more secure than most organizations themselves, with specialized security personnel and server experts protecting the data center at the physical level. In addition, most cloud computing service providers make mandatory backups of all data, which can effectively avoid the hidden dangers caused by data loss.

As a relatively new service function, cloud computing also has some disadvantages. For example, depending on the service provider, the level of customizability in configuration may vary greatly and may not meet the needs of a particular enterprise. At the same time, the use of cloud services will rely too much on providers, once they encounter technical problems, it will directly affect the business operations of enterprises. The use of cloud computing also depends on a strong and stable Internet connection, otherwise employees will not be able to work efficiently.

Despite the above shortcomings, the biggest concern for cloud solutions is the issue of data privacy. Although cloud service providers can ensure the security of stored data, transferring data through Internet always brings security risks.

After all, cloud computing is not free, and enterprises must carefully consider the time required for the use of resource capacity in order to maximize cost savings. In this regard, Cloud also takes scene CDN as its core business, providing customers with cloud storage, cloud processing, cloud security, traffic marketing and other cloud services to help users achieve accelerated content distribution, product development and business growth, as well as on-demand billing, with WebP, H.265, rate adaptation speed limit and other cost control-related functions to help enterprises save expenses.

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