[Science] A comprehensive understanding of "cloud storage" in one minute

The era of cloud storage is coming

Over the past decade or so, China's economy and scientific and technological strength have made remarkable progress, and many science and technology hot words have rushed out with this "torrent", and cloud storage is one of them.

For non-industry people, listening to the words such as big data and cloud storage, they can't help but make a "chill", but they feel nothing, but in fact, cloud storage, as a representative of technology products in the new era, has considerable practical value. It integrates various storage devices into one platform to serve people; it is worth mentioning that it provides a variety of customized services, so customers choose it not only for storage needs, but more Among them, customer-centric and variable data services are available at any time.

Cloud storage development track

According to Du Niang, cloud storage is a new concept extended and developed in the concept of cloud computing (cloud compuTIng). It is an emerging network storage technology, which refers to cluster applications, network technologies or distributed file systems. Function: A system that integrates a large number of different types of storage devices in a network through application software to work together to provide data storage and service access functions. When the core of computing and processing of cloud computing systems is the storage and management of large amounts of data, cloud computing systems need to be configured with a large number of storage devices, then the cloud computing system is transformed into a cloud storage system, so cloud storage is a data storage system. And management as the core of the cloud computing system. Simply put, cloud storage is an emerging solution for putting storage resources on the cloud for people to access. Users can easily access data at any time, anywhere, by connecting to the cloud via any networkable device.

In general, cloud storage is a service, an emerging service based on computer science. It can be a device, a tool, a network interface, etc., and each part of it can use storage as a platform. To carry out other data access; in addition, cloud storage can also be seen as a superposition of servers and storage devices. Cloud technology can greatly reduce the number of servers, greatly reduce data transmission links, reduce system construction costs, improve work efficiency, and ensure system Stable operation.

Structural model of cloud storage

The overall architecture of cloud storage is also very different from that of ordinary devices. It is not just a single hardware component, but multiple system distributions.

First, the storage layer

This is the most basic part of the cloud storage system. It contains many storage devices. It uses Internet technology to connect these different storage devices to form a management system for storage devices. The storage device is a unified storage device management system. Implement logical virtualization management of storage devices, multi-link redundancy management, and status monitoring and fault maintenance of hardware devices. In addition, the system can monitor and manage devices using modules in the system.

Second, the basic management

The basic management layer is the core part of cloud storage. It is also the most complex part on the storage layer. This management layer uses the distributed file system of the cluster to implement multiple tasks between storage devices, so that the storage device can provide new ones. Services, improve the possibility of data access, and ensure the security of data; at the same time, through various technologies and measures to ensure that the data in the cloud storage will not be lost, to ensure the security and stability of cloud storage itself.

Third, the application interface layer

The application interface layer is the most flexible part of cloud storage. Different cloud storage operating units can develop different application service interfaces according to actual business types to provide different services for users.

Fourth, the access layer

Any authorized user can log in to the cloud storage system through the standard public application interface and enjoy the cloud storage service. Different types of cloud storage operations, cloud storage provides different access types and access methods.

Push Button Switches

Push Button Switches

The Push Button Switches, also known as the control button (referred to as the button), is a low-voltage electrical appliance that is manually and generally can be automatically reset. The Push Button Starter Switch is usually used to issue a start or stop command in the circuit to control the turning on and off of electrical coil currents such as electromagnetic starters, connectors, and relays.

The On Off Push Button Switches refers to a switch that pushes the transmission mechanism with a button to make the movable contact and the static contact open or close and realize circuit switching. It is a master control device with a simple structure and a wide range of applications. In the electrical automatic control circuit, used to manually send control signals to control connectors, relays, electromagnetic starters, etc.

This Pushbutton Switches is a kind of electric device that is used to switch on and off the small current circuit when the action is released. Generally used in AC and DC voltage below 440V, the current is less than 5A in the control circuit, generally do not directly manipulate the main circuit can also be used in the interconnection circuit. In actual use, in order to prevent desperation, different marks are usually made on the buttons or painted with different colors, and the colors are red, yellow, blue, white, black, green, and the like.

The Momentary Push Button Switch could be divided into metal push button switches and LED Light Switches and ordinary snap button type, mushroom head type, self-locking type, self-resetting type, rotary handle type, with indicator light type, lighted symbol type and key type, etc., with single button and double Buttons. Generally, it adopts a water-storage structure, which consists of a button cap, a return spring, a static contact, a moving contact and a casing. It is usually made into a composite type, and has a pair of normally closed contacts and normally open contacts, and some products can pass. The series connection of multiple elements increases the number of contact pairs. There is also a self-contained button that automatically holds the closed position when pressed, and can be turned on only after the power is turned off.

When the Metal Switches is not pressed, the movable contact is connected with the upper stationary contact. The pair of contacts is called a normally closed contact. At this point, the movable contact is disconnected from the following static contact. The pair of contacts is called a normally open contact: the button is pressed, the normally closed contact is open, the normally open contact is closed, and the button is released. Restore the original working state under the action of the return spring

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