1U, 2U, 3U, how much do you know about the size of server chassis?

About the unit of "U"

 U is a unit that represents the external size of the server, and is an abbreviation for unit. The size of the server is specified, and the server can be placed on the rack in a chassis size. There are screw holes for fixing the server rack, so that it can match the number of the screw holes of the server, and then fix it with screws, so that the space required for each server can be easily installed.

1U2U4U Server case

The size specified by the server is the width (48.26cm=19 inches) and height (multiples of 4.445cm) of the server, and the thickness (height)) is based on 4.445cm.

Among the rack server sizes, the common ones are 1U servers case, 2U servers case, and 4U servers case. The dimensions of these servers are: 1U=4.445 cm, 2U=4.445*2=8.89 cm, 4U=4.445*4=17.78 cm. In actual use, 1U or 2U servers are the most frequently used. Because the service provider calculates the cost according to the space occupied by the server, the 1U server is the most space-saving and the cheapest, but the scalability of the 1U rack serve caser is not as good as that of the 2U server. 1U can have up to 4 3.5" hard drives, 2U can have 8 3.5" or more, and the number of PCI slots is also different, 1U can have up to 2, and 2U can have up to 6.

42U cabinet

The general classification of 42U cabinets is: 

1) According to the width: 600mm and 800mm wide 42U cabinets, the depths are: 600mm, 800mm, 900mm, 960mm, 1000mm, 1100mm, 1200mm, etc.;

2) According to actual needs: In addition to the actual size of 42U, the width and depth can be customized according to actual needs. 

The number of servers that can be placed in a rack is limited, and a rack with a height of 42U does not mean that 42 1U servers can actually be placed. After the server is placed, there is room for heat dissipation and movement, some space for wiring, and space for other equipment such as switches, firewalls, and monitors. Therefore, how many servers can be placed in a 42U cabinet needs to be calculated according to the specific equipment. So the question is, how many server devices are generally deployed in a rack?

The number of servers deployed in a cabinet needs to consider many parameters, such as physical parameters such as server volume, power consumption, and heat generation, as well as parameters such as power supply, cooling, and load bearing of the cabinet. How to determine how many servers can be deployed? When making a decision You can refer to the key parameters:

1) Reservation: Reserve 1U between each device for heat dissipation, reserve the position of the switch, and consider the position of the PDU;

2) Generally provide redundant 10KW power supply, the static carrying capacity is not less than 1200kg (determined according to the construction parameters of the computer room)

3) Under the premise of not exceeding the power, the cumulative number of equipment U in a cabinet generally does not exceed 26U

In a rack mount chassis the number of full 1U devices generally does not exceed 16, the full 2U devices generally do not exceed 12, and the full 4U devices generally do not exceed 4 to 7.

The uses of rack server chassis in the data center room are as follows:

1. Improve the overall aesthetics of the computer room with a variety of appearances

Based on the standard of 19-inch equipment installation width, many manufacturers have innovated the appearance of the cabinet, and considering the appearance effect of the cabinet in the environment of single placement and multiple placement, take Dinglong Company as an example, they In terms of appearance, aluminum profile cabinets are added, and on the basis of the original steel profile cabinets, various appearances are designed, such as curved mesh door cabinets, bow-shaped mesh door cabinets, concave-convex mesh door cabinets, etc.

2. Save the energy consumption of the computer room. Intelligent air supply cabinet

Users must solve the following problems: the communication equipment generates heat due to work, which will accumulate a lot of heat in the cabinet, affecting the stable operation of the equipment. The intelligent air supply cabinet can adjust the configuration according to the situation of each cabinet (such as the number of installed equipment, requirements for air conditioning, power supply, wiring and other infrastructure) on demand, avoiding unnecessary waste and saving initial investment. and energy consumption, bringing greater value to users. In addition, the value of intelligent air supply cabinet products is also reflected in the full load support of equipment. Generally speaking, a traditional cabinet cannot be fully equipped with equipment such as servers, because once a large number of equipment is installed, it is likely to cause local overheating of the rackmount chassis, causing the server in the enclosure to go down. Each cabinet in the intelligent air supply enclosure solution is independent, and the equipment can be cooled according to the operation of the equipment in the cabinet itself, so as to realize the full-load operation of the server case , thus greatly saving the space requirement of the equipment room and reducing the enterprise. the cost of. The intelligent air supply cabinet can save about 20% of the operating cost compared with the ordinary cabinet, and the energy saving effect is remarkable.

3. Realize the intelligent management function of the cabinet Smart cabine 

For the occasions where the operating environment and safety requirements of the cabinet in the data center room are high, the cabinet with an intelligent system is required to meet the relevant requirements. The main intelligence is reflected in the diversification of monitoring functions:

(1) Temperature and humidity monitoring function

The intelligent 19 inch rack cabinet system is equipped with a temperature and humidity detection device, which can intelligently monitor the temperature and humidity of the internal environment of the regulated power supply system, and display the monitored temperature and humidity values on the monitoring touch screen in real time.

(2) Smoke detection function

By installing a smoke detector inside the smart cabinet system, the fire state detection of the smart 19 rack enclosure system is carried out. When an abnormal situation occurs in the smart 19 rack mount enclosure system, the relevant alarm status can be displayed on the display interface.

(3) Intelligent cooling function

The user can set a set of temperature ranges for the regulated power supply system according to the temperature environment required by the equipment in the cabinet. When the temperature in the regulated power supply system exceeds this range, the cooling unit will automatically start to work.

(4) System status detection function

The intelligent chassis system itself has the LED indicator display of its working status and data information collection and alarm, and can be displayed intuitively on the LCD touch screen. The interface is beautiful, generous and clear.

 5) Smart device access function

The 19 rack enclosuret system has access to intelligent equipment including intelligent electricity meter or UPS uninterruptible power supply, and reads the corresponding data parameters through the RS485/RS232 communication interface and Modbus communication protocol, and displays them on the screen in real time.

(6) Relay dynamic output function 

When the linkage of the pre-designed system logic is received by the intelligent enclosure system, it will send a normally open/normally closed information to the DO channel of the hardware interface to drive the equipment connected to it, such as sound and light alarms, fans. and other equipment.