北美作业代写：Network storage

下面为大家整理一篇优秀的essay代写范文- Network storage，供大家参考学习，这篇论文讨论了网络存储技术。网络存储技术是基于数据存储的一种通用网络术语。网络存储技术的出现，使人们对海量数据的存储以及数据的安全和备份等要求得到了满足。相对于传统的存储技术，在数据共享、存储容量的扩展性还是数据的安全性方面，SAN和NAS都有着明显的优势。NAS和SAN各有长短，在实际应用中，可以将两种存储技术结合使用，进行优势互补。

The advent of the information age has brought new problems to people: the generation, storage and access of massive data. Therefore, network storage technology has emerged. Network storage technology is a common network term based on data storage. With the emergence of network storage technology, people's requirements on storage of massive data, data sharing and analysis, and data security and backup have been met. However, how to effectively guarantee the security of these data, ensure the timeliness of these data access and the rapid recovery of data in the case of system failure has become an important issue and difficulty at present.

Direct connection storage is the direct connection of a data storage device such as a disk array or tape library to a server or client via an extended interface. The DAS is server-centric, with no storage operating system, meaning that the storage device is part of the server, and I/O requests are sent directly to the storage device. The advantages of this approach are simple implementation, low cost and quick results. But storage management is tedious and repetitive, capacity is hard to reallocate, response times slow when the server is busy, and scalability performance is poor. NAS is different from DAS. Its storage device is not directly connected to the server, but directly connected to the network and connected to the server through the standard network topology. In this storage mode, the application and data storage parts are on different servers, respectively, application server and data server. The data server has its own operating system and can convert the "file.i /O" File storage request of the borrowed application server to "block.i /O" and send it to an internal disk. Different application servers can access the data server through the LAN interface, which realizes the data sharing between heterogeneous servers. NAS are characterized by storage independence, protocol independence, ease of management and good performance/performance ratio. However, since NAS and normal business access use the same network, they will cause mutual influence. When the amount of NAS is relatively large, the demand for network resources can be reduced through NDMP, and local backup and disaster recovery can be achieved. NDMP is an open protocol based on enterprise data management, which defines a network-based protocol and mechanism for controlling backup, recovery, and data transfer between primary and secondary storage. The NDMP structure is based on the client/server model in which data producers and consumers are considered to be servers or service providers, or data service providers; Backup management software is considered a client. You can only have one client per NDMP session, but you can have multiple servers. Storage area network concept. Storage area network. A SAN is a storage structure that connects a storage device and related servers through a dedicated transport channel. SAN mainly consists of three parts: storage device, special transmission channel and server. Like NAS, SAN also supports data sharing between heterogeneous servers, and SAN storage devices can be located in agreed geographic locations or extended to different locations. SAN and server are independent and peer, communicating with each other through high-bandwidth hubs or switches. The server can access any storage device in the SAN through a dedicated transport channel and use it as a local storage device. Communication between storage devices, between storage devices, and SAN switches can also be conducted directly without the server. Each workstation through local area network access server, the server through the transmission channel dedicated to the storage device to send data request "Block. The I/O", and storage devices to communicate, SAN storage technology to a storage device isolated from the local area network, an independent storage network, to avoid the heavy traffic data transmission network bandwidth of blocking and conflict. Specific advantages of SAN include:

By using special transmission channels, SAN can transfer massive data between storage devices and servers, reducing the time cost for data backup and recovery and the occupation of LAN network resources. Sans are highly scalable and can add storage without interrupting the connection to the server without impacting network performance. Through independent regional storage and data sharing on several storage devices, the SAN can manage and control the storage devices and data in several ways, realizing remote management without human. SAN can realize remote storage and improve disaster tolerance.

Compared with traditional storage technologies, SAN and NAS have obvious advantages in data sharing, storage capacity scalability and data security. The common points of SAN and NAS are: centralized storage and management of data, which improves the high availability of data. Allow data to be isolated from application servers and Shared between heterogeneous servers; High efficiency data backup is realized through redundancy structure, and data integrity is guaranteed. The differences between SAN and NAS are as follows: in terms of device management, NAS must independently manage the storage devices of each node, while SAN is convenient for centralized mud scraping of all storage devices. In terms of performance, NAS USES LAN and server communication to occupy certain network resources, increase network load, and at the same time, performance is limited by network bandwidth. If performance is to be improved, bandwidth must be increased, which increases the cost. SAN is by means of fiber channel technology, which does not occupy the bandwidth of LAN, and is superior to NAS in connection extension and I/O performance. Although the performance of NAS is not as good as that of SAN, the technology of NAS is mature and relatively cheap. In terms of implementation and maintenance, NAS can be used as long as the storage device is directly connected to the LAN, and NAS supports plug and play. The SAN's storage device is connected to the client via a private switch, and if the client is to be added, the switch must be cascaded. Therefore, NAS are easier to maintain than SAN. From these comparisons, it can be seen that both NAS and SAN have different lengths. In practical application, two storage technologies can be combined to complement each other.

Due to the shortcomings of the above technologies, a new generation of sans has emerged, that is, sdd-sdd adopts the switch parallel instead of cascade when extending the client, without changing the previous connection and improving the maintainability. The use of switches in parallel reduces connection nodes, simplifies the structure, and improves stability and security. Moreover, SDD has changed the traditional RIAD storage structure, adopting two-level RAID and making RAID between the disk towers, which has greatly improved the storage capacity and fault tolerance.

The development of network storage technology towards high capacity, high speed and high security has achieved great results. It is believed that in the near future, network storage technology will be further developed, bringing greater convenience to people's life and work.

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