Shulou(Shulou.com)06/03 Report--

Today, I would like to talk to you about the difference between distributed storage and centralized storage. Many people may not know much about it. In order to make you understand better, the editor has summarized the following for you. I hope you can get something from this article.

1. The physical media of centralized storage are centrally distributed, while the physical media of distributed storage are distributed to different geographical locations.

2. Centralized storage has high requirements for computer room environment, requiring large computer room space, while distributed storage is distributed deployment of small capacity equipment, so the requirement for computer room environment is low.

Choice of distributed and centralized storage

The advantages and disadvantages of centralized storage are that physical media are centrally distributed; uploading video streams to the center requires a high environment in the computer room, which requires large space in the computer room, load-bearing, air-conditioning and so on.

The advantages and disadvantages of distributed storage and centralized management are that physical media are distributed to different geographical locations; video streams are uploaded nearby, so there is no requirement for backbone network bandwidth; multiple sets of low-end and small-capacity storage devices can be distributed and deployed with low equipment price and maintenance cost; small-capacity devices are distributed and deployed with low requirements for computer room environment.

Considerations for distributed storage

1. Consistency

Distributed storage systems need to use multiple servers to store data together, and with the increase of the number of servers, the probability of server failure is also increasing. To ensure that the system is still available in the event of a server failure. The general practice is to divide a data into multiple copies and store it on different servers. However, due to failures and parallel storage, there may be inconsistencies between multiple copies of the same data. Here, it is called consistency that ensures that the data of multiple copies are completely consistent.

2. Availability

Distributed storage systems require multiple servers to work at the same time. When the number of servers increases, it is inevitable that some of them fail. We hope that this situation will not have too much impact on the whole system. After the failure of some nodes in the system, the read / write request of the customer server is called availability.

3. Fault tolerance of partition

Multiple servers in a distributed storage system are connected through a network. However, we can not guarantee that the network is always unobstructed, and distributed systems need to have a certain degree of fault tolerance to deal with the problems caused by network failures. A satisfactory situation is that when a network is broken down into multiple parts due to failure, the distributed storage system can still work.

After reading the above, do you have any further understanding of the difference between distributed storage and centralized storage? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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