In the storage disk, find the music folder, open it and select the download folder to see the stored music, or just click on the music on the left and select the download folder.

Storage (cún chǔ) refers to storage; recording (information) in an electronic device so that the data can be taken out when needed.

Common storage methods

1. DAS (Direct Attached Storage). This storage method is the same as our ordinary PC storage architecture. External storage devices are directly attached. Connected to the server's internal bus, the data storage device is part of the entire server structure.

DAS storage method is mainly suitable for the following environments:

(1) Small network

Because the network scale is small, the amount of data storage is small, and it is not very complicated. , using this storage method will not have a great impact on the server. And this storage method is also very economical and suitable for enterprise users with small networks.

(2) Geographically dispersed networks

Although the overall enterprise network is large, it is geographically dispersed, and it is very difficult to interconnect them through SAN or NAS. , at this time, the servers in each branch can also use DAS storage, which can reduce costs.

(3) Special application servers

On some special application servers, such as Microsoft cluster servers or raw partitions used by some databases, storage devices are required to be directly connected to the application server. .

(4) Improve DAS storage performance

Among the various connection methods between servers and storage, DAS was once considered an inefficient structure and inconvenient for data processing. Protect. Direct-attached storage cannot be fully shared, so it often happens that a certain server has insufficient storage space, while other servers have a large amount of idle storage space that cannot be used. If storage cannot be fully shared, there will be no balance between capacity allocation and usage demand.

2. NAS (Network Attached Storage) data storage method

The NAS (Network Attached Storage) method has comprehensively improved the previous inefficient DAS storage method. It uses a file server that is independent of the server and developed solely for network data storage to connect the stored devices and form a network. In this way, the data storage is no longer attached to the server, but exists in the network as an independent network node and can be enjoyed by all network users.

Advantages of NAS:

(1) True plug-and-play

NAS is an independent storage node that exists in the network and operates with the user The system platform is independent, truly plug and play.

(2) Simple storage deployment

NAS does not rely on a general operating system, but uses a user-oriented simplified operating system designed specifically for data storage, with built-in protocols required for network connections, thus making the management and setup of the entire system simpler.

(3) Storage device location is very flexible

(4) Management is easy and low cost

The NAS data storage method is designed based on the existing enterprise Ethernet , communicate according to the TCP/IP protocol, and transmit data in the form of file I/O.

Disadvantages of NAS:

(1) Low storage performance

(2) Low reliability

3. SAN ( Storage Area Network) storage method

In 1991, IBM launched ESCON (Enterprise System Connection) technology in the S/390 server. It is a connection method for servers to access storage based on optical fiber media with a maximum transmission rate of 17MB/s. On this basis, the more powerful ESCON Director (FC Switch) was launched to build the most original SAN system.

SAN storage method creates storage networking. Storage networking conforms to the trend of computer server architecture networking. The supporting technology of SAN is Fiber Channel (FC Fiber Channel) technology. It is a standard integration established by ANSI for network and channel I/O interfaces. FC technology supports multiple advanced protocols such as HIPPI, IPI, SCSI, IP, and ATM. Its greatest feature is to isolate the communication protocols of the network and equipment from the transmission physical medium, so that multiple protocols can be transmitted simultaneously on the same physical connection.

The hardware infrastructure of SAN is Fiber Channel. A SAN built with Fiber Channel consists of the following three parts:

(1) Storage and backup equipment: including tapes, disks and optical disks Ku et al.

(2) Fiber Channel network connection components: including host bus adapter cards, drivers, optical cables, hubs, switches, bridges between Fiber Channel and SCSI

(3) Application and management software: including backup software, storage resource management software and storage device management software.

Advantages of SAN:

(1) Easy network deployment;

(2) High-speed storage performance. Because SAN uses Fiber Channel technology, it has higher storage bandwidth and significantly improved storage performance. SAn's fiber optic channel uses the principle of full-duplex serial communication to transmit data, with a transmission rate of up to 1062.5Mb/s.

(3) Good expansion capabilities. Because SAN adopts a network structure, it has stronger expansion capabilities. The fiber optic interface provides a connection distance of 10 kilometers, which makes it very easy to implement physically separated storage that is not in the local computer room.