Regarding servers: According to the chassis structure of servers, they can be divided into four categories: "desktop servers", "rack servers", "cabinet servers", and "blade servers". (1) Desktop servers (2) Rack servers (3) Cabinet servers (4) Blade servers.

       Tower servers/desktop servers are also known as "tower servers". Some desktop servers use chassis that are roughly the same size as regular vertical computers, while others use large capacity chassis, like a large cabinet. Due to its weak functionality, low-end servers have a relatively simple internal structure, so the chassis is not large and all adopt a desktop chassis structure. The desktop introduced here is not a typical desktop computer, and the vertical chassis also belongs to the range of desktop computers. Currently, this type of server holds a considerable share in the entire server market. Like a desktop computer, it takes up a lot of space and is suitable for some small businesses to use. The width and depth of other sizes may be similar, but they should be several U higher.

       Rack mounted server: It is a server type with a standard width of 19 inch racks for the intensive deployment needs of enterprises. Placing servers on a rack is independent of each other, which not only facilitates daily maintenance and management, but also may avoid unexpected failures. Rack mounted is an international standard with a basic width of 482mm. Generally, at a height of 1 U (1U=1.75 inches), 2U, 4U, and other specifications, the width is generally standard 19 inches, and there are depths of over 700mm and over 800mm. Usually, a 1U rack server is the most space saving, but its performance and scalability are poor, making it suitable for some relatively fixed business usage areas. Products above 4U have high performance and good scalability, generally supporting more than 4 high-performance processors and a large number of standard hot swappable components. Management is also very convenient, and manufacturers usually provide corresponding management and monitoring tools, which are suitable for high-volume critical applications, but the volume is large and the space utilization rate is not high.

       Blade server: It is a highly available and high-density server architecture that has become popular in recent years, designed specifically for special application industries and high-density computing environments. Each blade is actually a system motherboard, similar to an independent server. In this mode, each motherboard runs its own system, serving designated different user groups, without any correlation between them. However, system software can be used to assemble these motherboards into a server cluster. Regarding tower servers: In principle, tower servers do not need to be used in conjunction with cabinets, but they can also be stored in cabinets for some reason. However, there are some issues, such as the inability to change the placement direction of tower servers, which often leads to issues such as occupying large cabinet space and not being fixed. It's better to weigh the pros and cons of the specific environment to make a decision. You can use a conversion kit to convert it into a horizontal one, so that you can coordinate within the cabinet. Whether to connect the display depends on factors such as the arrangement of cabinet space, the number of servers, the frequency of server direct operation, monitoring requirements, and cabinet management requirements. As a server, it is generally not recommended to perform direct operations frequently, so long-term direct connection to the monitor is also an unsafe factor. Buy a rack mounted one, without connecting to a monitor, and connect it remotely, which not only saves monitor space but also looks beautiful.

       Tower servers are generally the most commonly seen, and their appearance and structure are similar to ordinary PCs. However, they are slightly larger, and there is no unified standard for their overall dimensions. The motherboard of tower servers has strong scalability and many slots, and the chassis of tower servers often reserves a lot of space for redundant expansion of hard drives, power supplies, etc. This type of server does not require additional equipment, does not require much storage space, and has good scalability and high configuration. Therefore, it has a wide range of applications and can meet the common server application needs.

       This type of server is particularly suitable for common entry-level and workgroup level server applications, and its cost is relatively low, and its performance can meet the requirements of most small and medium-sized enterprise users. Currently, there is still a large market demand space.

       However, this type of server also has many limitations. When multiple servers need to work simultaneously to meet higher server application requirements, due to its large size, high space occupation, and inconvenient management, it becomes very unsuitable.

       Rack server: The appearance of a rack server does not look like a computer, but rather like a switch, with specifications such as 1U (1U=1.75 inches=4.45CM), 2U, 4U, etc. The rack mounted server is installed in a standard 19 inch cabinet. This type of structure is mostly functional servers.

       A server with many different device units or several servers placed in one cabinet is called a cabinet server.

       For important enterprises such as securities, banks, posts and telecommunications, systems with complete fault self-healing capabilities should be adopted, and redundant measures should be taken for key components. For servers used in critical business, dual hot backup high availability systems or high-performance computers can also be used, which can ensure good system availability.

       Blade servers are a low-cost server platform for HAHD (High Availability High Density), specifically designed for special application industries and high-density computer environments. Their main structure is a large main chassis, which can be inserted with many "blades" inside. Each blade is actually a system motherboard, similar to individual servers, They can boot their own operating system through their local hard drive. Each blade can run its own system, serving different user groups specified, without any correlation between them. Moreover, system software can also be used to assemble these motherboards into a server cluster. In cluster mode, all blades can be connected to provide a high-speed network environment, share resources, and serve the same user group. Inserting new blades into the cluster can improve overall performance. Due to the fact that each blade is hot swappable, the system can be easily replaced and maintenance time can be minimized.

       Blade servers save more space than rack servers, and at the same time, the issue of heat dissipation is more prominent. It is often necessary to install large powerful fans inside the chassis to dissipate heat. Although this type of server saves space, its cabinet and blade prices are not low. It is generally used in large data centers or areas that require large-scale computing, such as banking, telecommunications, finance, and internet data centers.

       At present, saving space, facilitating centralized management, easy expansion, and providing uninterrupted services have become new requirements for the next generation of servers, and blade servers can precisely meet this demand. Therefore, the demand for blade servers in the market is constantly expanding, with good market prospects. There are two main categories of blade servers in the current market: one is mainly designed for the telecommunications industry, with interface standards and size specifications that comply with PICMG (PCI Industrial Computer Manufacturer's Group) 1. x or 2. x. In the future, products that comply with PICMG 3. x will be launched, and blades and cabinets from different manufacturers using the same standard can theoretically be compatible with each other; The other type is universal computing design, which may adopt the above standards or manufacturer's standards on the interface, but the size specifications are determined by the manufacturer and pay attention to performance price ratio. Currently, most products in this category belong to this category. Blade servers are currently the most suitable for cluster computing and IxP to provide internet services. Differences between each other:

       The main difference is the appearance. Multiple thin servers can be inserted into a blade server, sharing a common power supply, but heat dissipation has always been a difficult problem to solve. The tower server looks like our desktop computer.

       Rack mounted servers can be placed on standard racks. It is usually calculated based on U, and if you handle hosting, it is best to use rack mounted to save money.

Standard cabinets are widely used for stacking computer network equipment, wireless communication equipment, electronic and other equipment. The cabinet has the advantages of enhancing electromagnetic shielding, weakening equipment working noise, and reducing equipment floor area occupation. For some high-end cabinets, they also have air filtration function to improve the working environment quality of precision equipment. Many engineering grade equipment use a panel width of 19 inches, so a 19 inch cabinet is the most common standard cabinet. There are many types and styles of 19 inch standard cabinets, including imported and domestic ones, and there is also a significant difference in price and performance. The prices of cabinets of the same size and different grades may vary by several times. Users should choose suitable products based on the specific situation and budget of installing and stacking equipment when purchasing standard cabinets. The structure of a standard cabinet is relatively simple, mainly including the basic framework, internal support system, wiring system, and ventilation system. Standard cabinets can be divided into many performance and price levels based on their assembly form and material selection. The appearance of a 19 inch standard cabinet has three conventional indicators: width, height, and depth. Although the installation width for 19 inch panel equipment is 465.1mm, the common physical widths for cabinets are 600mm and 800mm. The height generally ranges from 0.7M to 2.4M, depending on the number of equipment inside the cabinet and the unified style. Manufacturers can usually customize special heights, with common 19 inch cabinets having heights of 1.6M and 2M. The depth of the cabinet generally ranges from 400mm to 800mm, depending on the size of the equipment inside the cabinet. Manufacturers can also customize products with special depths. Common 19 inch cabinets have depths of 500mm, 600mm, and 800mm. The height occupied by the installation of equipment in a 19 inch standard cabinet is represented by a special unit "U", where 1U=44.45mm. Equipment panels that use a 19 inch standard cabinet are generally manufactured according to the specifications of nU. For some non-standard devices, they can mostly be installed into a 19 inch chassis and fixed through an additional adapter board.